a lot of "laser attacks" from enemies and ethereals seem to be made up of ether, which makes qualifying them as actual lasers kind of weird, but there are some attacks that seem to use more standard lasers
there are laser turrets in certain levels that travel in straight lines and at consistent speeds, and they're also described as
being used to "burn ethereals" which suggests that their main form of causing damage is heat-based
there was a calc in that chihiro/miyabi blog that got miyabi moving with lasers to
sub-relativistic, which could be applied to every agent seeing as how they're universal throughout multiple different levels.
not saying i necessarily fully buy them being legitimate, but i thought i'd at least point out some arguments that might help support them