A bold tweet on several fronts and I love it. First, they are confidant enough to say it can be done and they can do it. Second, it's the first time I've seen them tag themselves alongside a Mayo tweet. Be it reply or retweet. They may have before but I haven't seen it.
It also obviously implies they will be in a position, FDA-wise, to perform such a procedure. But to be honest, I'd think a long time in the future.
IMO, when taking their relationship in to consideration, the fact that Vivos would make that comment to Mayo's tweet, knowing Mayo would see it just seems pretty comfortable to me.