Doom and Doom II get a ‘definitive’ re-release that’s packed with upgrades
jay@mbin.zerojay.com to 
theverge.com
If you own either game already, you’ll get it for free.
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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.
Looks like it's a different engine, actually. So yeah, makes sense that if they needed to reimplement features, it's new code that wasn't pulled from Boom, so doesn't need to be GPL.
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.