The current headline (“strongly resistant to past immunity”) is editorialized and not what the research here shows. It’s resistant to donor antibodies, which is definitely unfortunate and concerning, but there’s more to immunity than just antibodies, and even more to antibodies than just the ones donated. Preliminary research [1] shows that vaccines are still effective, at least, and likely that implies natural immunity is still effective too.

[1] https://www.biorxiv.org/content/10.1101/2021.01.15.426911v1