Wow, this is sad to hear. So if I understood correctly, node is walking back from trying to run TypeScript? Pretty sad if so.

I hope it's a temporary step back to leap forward, in the future.

Only for non-erasable Typescript! The support for running erasable TS is here to stay. It's not ideal, but on the other hand this is paving the way for the TC39 proposal - if that ever progresses...