Honestly, I'm not seeing much 'hard
SF' in that design. It's covered in rivets and concave surfaces, which reduce both protection and stealth. Looks like a flat-bottomed hull (i.e. vulnerable to mines and IEDs). It doesn't seem to have any form of drone defense or other active countermeasures, and no missiles. There are no rear and side view cameras. Front window instead of periscopes or cameras. The exhausts look more dieselpunk than modern. It might have been hard
SF in the 1960s, but now it's distinctly retro.
Not that retro-
sf is a bad look. I'm a big fan of raygun gothic and cassette futurism. It will work fine for a lot of settings, including
40k. It just doesn't look like a realistic extrapolation of current trends and reasonable speculation about near-future technology.