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Chromium is licensed with 3-clause BSD, which allow developers to make closed source proprietary product on top of open-source code. Microsoft Edge isn't opensource as Google Chrome isn't open-source while they're both built on chromium.
I don't think Microsoft ever claimed it was open-source.
Was sure from day one when they first announced the chromium pivot that they’d definitely cop out citing the license. Not surprised all these years later.
I guess it's marketing and smoke on the eyes, unfortunately.
It could be that sources are actually available somewhere but I couldn't find them either.
Chromium is open source and thats what Edge (and Chrome) is built on. So yeah you cant really say that Edge is directly open source I guess.
The question about "Where's the code?" has been answered by another commenter, but a quick observation about "praise" for Microsoft's decision regarding Edge:
I'm not sure it was praise as much as relief. As someone who lived through the dumpster-fire years of Internet Explorer (IE) dominance, I was relieved that Microsoft wasn't still going their own way. They would use something more or less standard. I don't think I was alone in that relief. That may have sounded like praise.
Of course, there's a completely different question about whether Chrome/Chromium is becoming the new IE, at least in the sense that standards matter less than "the way Chrome does it." But (hopefully) that's still an open question.