If you travel to China, this is old news.
Yes, some businesses are beginning to require wiped travel laptops for entering the US. I have to say that I do not know anyone personally who has had laptop issues at the US border (although I know that there are some people who are on some sort of list and have them frequently). The assumption is, if you go to China, you will probably be hacked, and it's not going to happen at Customs.
By the way, in my experience Chinese firms are incredibly paranoid about this, much more so than US firms. I suspect that paranoia has some justification.