No, it categorically does not support the SAMD21.
I even asked on the official discord last night after questioning it just being undocumented.
discord. com /channels/787627282663211009/1407661338494505061
Apologies for the tone, and use of the word garbage, but at best it’s a misleading answer that’s wrong about SAMD21 support and is supplied with an irrelevant wokwi project link.
Unfortunately this thread was relatively high in the search engine results for “wokwi samd21” and I was trying to find out how myself (as a massive wokwi fan for the last few years) for a current github CI test on embedded arduino stuff on various architectures.
As a result, coming up against this as “the best available answer” was frustrating as it’s incorrect.