The L5 thing is weird because the listed minimum qualifications would apply someone 4yr out of college (which doesn't usually correlate with L5) and the rest of the listing is very much worded in a way that is seniority-agnostic.

Depending on how many of the requested qualifications (i.e. you come from a background that gives you little to no experience on most of them but a lot of depth on one specific ones) you hit 90k may be reasonable.

This really just looks like a boilerplate job description with the bare minimum tweaks. Not surprising that the salary range wasn't tweaked.