Should supervisors read acknowledgments before the printed version of the thesis?
There is no need to remove the acknowledgement in the final version. I know students have done so and for very different reasons, they want to "surprise" someone, they are not on friendly terms with an advisor and does not want the advisor to see it before it is printed. etc. The "surprise" aspect is, I would argue, greatly overrated. To not provide it because of a conflict is not likely to help the conflict. So, even if the reason is non-controversial, not including it might raise an eyebrow of a sensitive advisor. In the end, this is something that should not matter but some people are overly sensitive so ask yourself, are you confident that you will reach your intended effect by doing what you suggest, then go ahead, but if you do not feel so, avoid it. You will sometimes be surprised how much is read into a benign text such as an acknowledgement.