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I suppose you could make an argument that certain parts of the human nervous system like the retina and/or the visual cortex are deterministic enough to be controlled in this way and that other parts of the human psyche do not function deterministically and cannot be controlled so easily. I think it is somewhat on tenuous ground to state that one's world-model can be predictably influenced but one's personality cannot, the line between the two has never been a clear-cut one, but let's go with that for now and have a look at personality manipulations.
Something that bolsters the idea of consciousness as alterable and deterministic are certain types of brain damage that impact human behaviour in somewhat predictable ways, for example lesions on the periaqueductal gray can cause intentional activity to cease entirely, a condition covered in The Hidden Spring by Mark Solms.
Also covered in that book is a condition called Korsakoff psychosis, a condition characterised by amnesia and confusion caused by thiamine deficiency-related damage to the limbic system. One of the main symptoms is confabulation, where memory is disordered to an extent that the brain retrieves false memories. There was a man (Mr S) affected by this who constantly believed he was in Johannesburg and simply could not be convinced otherwise, and believed his condition was due to him missing a "memory cartridge" that could just be replaced. His false beliefs are not only indicative of a change in perception, but also in how he is, in some sense. When blind raters were brought in to evaluate the emotional content of his confabulations, Mr S's confabulations were found to substantially improve his own situation from the emotional point of view - so confabulation occurs not only because of deficits in search and source monitoring, but also release from inhibition of emotionally mediated forms of recall.
Here's another case study from The Hidden Spring: An electrode implanted in a reticular brainstem nucleus of a 65 year old woman reliably evoked a response of extreme sadness, guilt and hopelessness, where she claimed that she wanted to die and that she was scared and disgusted with life. When stimulation was stopped, the depression quickly ended and for the next five minutes she was in a hypomanic state. Stimulation at other brain sites did not elicit this response. In other words one carefully placed electrode completely rewrote her emotional state.
Urbach-Wiethe disease, calcification of the amygdala, impairs people's ability to feel fear through exteroceptive means (though they can still feel some kinds of fear, such as those induced internally via CO2 inhalation). Unilateral injury to the right cerebral hemisphere can cause hemispatial neglect, a condition where the affected person neglects the left side of their visual field; they literally have no concept or memory of vision on the neglected side and can easily read half of a clock or eat half the food on their plate without noticing that anything is missing. They do not feel the need to turn. The entire idea of there needing to be a left side of their visual field is just gone.
If there's a difference between any of that and "externally induced manipulations can greatly affect how human consciousness functions", I'm not sure what it is. Your general critique in this situation could be that these manipulations are not fine-grained enough to constitute "mind control", but the fact that our current known methods of manipulation aren't enough to craft someone into exactly how we want them does not mean that they don't provide evidence in favour of a mechanistic outlook regarding human consciousness.
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