Yeah, I just found it from her page, been following her for a while.
Saw a similar complaint on cohost (too long to fit in a screenshot) https://cohost.org/lexyeevee/post/7224213-empty
Yeah it's a port to Nightdive's Kex engine. It wasn't a literal accusation of a GPL violation, more just being disappointed about seeing open source work being captured into proprietary software.
One of her points that resonated with me was that to get modern levels to work they did have to re-implement Boom features, which were GPL.
YouCANN do anything you want?
Easy mode already exists, it's called summoning.