Well, theoretically, perfectly. Practically, there's some exploits lingering in there for sure. But that's true for virtualizers too, so... As the article says

Well, theoretically, perfectly. Practically, there's some exploits lingering in there for sure. But that's true for virtualizers too, so... As the article says, faster spinup (since v8 is already running) seems to be the customer's greatest advantage only, saving an order of magnitude of memory is certainly a big deal for the operator. I think since you can compile pretty Much anything to webassembly, porting over some existing tools might even be viable.