I started writing how this is probably a good opportunity for a check-raise from GTO perspective, because in general this kind of board tends to be good to the pre-flop raiser, but in real world it would depend much more on my previous actions and on what is my image to Phil.
But the more I wrote, the more I realized that a call does not make much sense in any perspective. A call here is like yelling, "Hey, I just flopped good, please don't fold." Let's take from Phil's perspective. After a pot size bet, what hands we are calling? Does not make sense to call with anything besides made hands, even if they are as marginal as pocket fives, or if they are as great as this full house! With a check-raise, we balance bluffs and good made hands, and we take the initiative.
If I am 3-betting in a good frequency, and if I also have a good check-raise frequency on dry boards (a bit closer to a GTO play), I will not only check-raise with my monsters, but also with my draws. Well, if I am in a heads-up with Hellmuth, it probably means I am a good HU player, and yeah, I am going to do it. I will not raise only with made hands, but also with good draws, and sometimes with junk. This board does not offer many draws, though. But we have a lot of junk hands options to bluff. Check-raising this set is specially good because we don't block an ace for him. But even if we had Ax, calling does not seem the best approach.
What are we going to do on the turn if he checks (because has a junk hand)? Bet 1/3 and hope to get called? Fire a pot bet trying to represent a bluff? This is an easy fold for Mr. Hellmuth, we just made his life easier, and he just lost the same amount as he would have lost after our check-raise. But the difference of check-raising is that we would win this amount many times with bluff combos. If he calls, ok, we mostly have a free river before giving up.
This is why I would check-raise Mr. Hellmuth to 10 BB.