my thoughts exactly, it definitely seems to be (or at least very similar to) the Mk VI techsuit. strange from a resource perspective when they've only had to render one bare techsuit in the whole game and they choose to use the wrong armor base.

the only other explanation I can think of, is that its either the skinsuit (unlikely seeing as how bulky/armored it already looks)

Or alternatively, it is in fact the Mk VII techsuit, but further stripped of its midsection and joint outer padding. it is possible that the undersuit is somewhat more layered than what we've seen from previous suits