If you do not trust colleges to be truthful when they say that level of applicant’s interest is not considered for admissions, then you are free to expend extra effort showing additional interest even to colleges stating that it is not considered.
Note, however, that not using level of applicant’s interest for admission does not necessarily mean that the college will not use it for other purposes, like estimating the likelihood that a given admitted student will matriculate. Awarding of merit scholarships may be another instance – the college may see no point in offering to someone who is very unlikely to matriculate, but also may see no point in offering to someone who appears certain to matriculate even without an extra incentive from a scholarship.