I'm not sure why this is framed as an issue for security teams. Transpiling software has been a thing for ages. Especially in the JS world. Decompiling has been a bit harder without automation, but unless you have black box tests, this process will take ages to verify that the result has matching functionality.

So why would the blue teams care beyond "oh fun, a new tool for speeding up malware decompilation"?

Edit: To be clear, I get the new reverse engineering and reimplementation possibilities got much better and simpler. But the alarmist tone seems weird.