So, I would take their current claim with a large grain of salt.
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[1] What's even sadder is Tommy (the programmer of the SMB team) clearly shows he knows nothing of Linux, the community, licensing, or even good programming for that matter. Here's a couple of examples:
1. There's a screenshot above of the lack of security with the high-score servers
2. Complete lack of portability. Humble Bundle of SMB (Linux port) doesn't even run.
3. Bugs. On Windows, you start the game and for some odd reason the game mutes itself.
The games great, but for such a buggy product, I'd keep programming opinions to myself.
I have a feeling the issue might be at least partly caused with issues on OpenGL/SDL/X11 or something like that. I've had no end of issues with fullscreen games under Linux.
To be charitable here, we're talking about a 2 man team (who shipped a successful product on their own) rather than a large AAA dev with an actual QA dept. Tommy might not be the greatest programmer (I remember reading something he wrote where he had some strange views on threading) but I think criticism has to be offset against that.
And at the end of the day they shipped a Linux game before Steam on Linux was even announced, apart from that one issue it seems to work flawlessly (for me at least) under Ubuntu including actually recognising an Xbox360 pad which Braid didn't.
So, I would take their current claim with a large grain of salt.
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[1] What's even sadder is Tommy (the programmer of the SMB team) clearly shows he knows nothing of Linux, the community, licensing, or even good programming for that matter. Here's a couple of examples:
1. There's a screenshot above of the lack of security with the high-score servers
2. Complete lack of portability. Humble Bundle of SMB (Linux port) doesn't even run.
3. Bugs. On Windows, you start the game and for some odd reason the game mutes itself.
The games great, but for such a buggy product, I'd keep programming opinions to myself.