Actually now that I compare the two side-by-side, it's evident this isn't just a saturation shift, but a significant hue shift as well.
What was yellow, is now orange. It's not even bright orange, but rather a dull burnt orange, so it loses the aspect of being intentionally painted with a high-visibility color for safety, which emphasizes that it's a non-combat droid. You
want high-vis colors to be bold and eye-catching. That's the entire point. Anyone who thinks these colors should "blend into the world" has critically failed to understand the assignment.
Additionally, consider this: Aliens (1986) was still a huge cultural presence while SS2 was in development. And what did Aliens prominently feature?
And yes,
it was bright yellow when you can see past all the on-set fog and lighting. Did the power loader influence the appearance of the maintenance bot? I'd lay good odds on it.
So if a yellow mech suit was good enough for one of the greatest scfi films of all time, I'd say a yellow mech is still good enough for SS2. The dull orange take is just change for the sake of change.