Of course this is happening. Gitlab's values were only there for marketing - just take a look at their massive turnover of employees who get burn so fast they don't have time to update the About page fast enough.
Gitlab is a terrible company, period.
You're wrong about the values. Since the start, GitLab's values were real and lived, unlike every other company I've been at. Only after Staples' takeover as CEO and C-suite changes, they started eroding rapidly, starting with Transparency.
Source: I'm ex-GitLab
Yeah it was a pretty awesome place to work up until the IPO, my first year was probably the most enjoyable I've ever had at a job.