It might not even be a fat-finger, they might legitimately use 200C rated tape where it's needed and 155C tape where the higher spec is not needed. I am not a kapton expert but maybe higher temp ratings are less flexible or less resistant to hard vacuum or something like that. This might just be a plain old engineering QA issue. These are complex machines, and these sorts of things happen.

I don't know how space-rated QA works, as I am but a lowly terrestrial engineer, but I imagine there are specs for each portion of the machine calling out electrical ratings, temperature ratings, vibration ratings, etc. If the spec definitions for that section of machine are bad it's hard to do proper QA against those specs.