I don't think the umpire should have disrupted the match to the extent he did. I don't think he let them play. I think it was ill-advised and made the match about something other than table tennis. However, those guys are pros. If they are warned or faulted and told that they are not tossing the ball vertically enough and that the umpire does not want them to toss the ball in towards their body, they should be able to do that. And both of them were. Was it enough up to make the amount the ball was going towards them acceptable. Yeah. Was it a legal toss? It is debatable. The toss is going up and towards him. Both of them are doing it. I think, if you are a professional and an umpire calls you for something like that, if you cannot correct it and make the toss enough more vertical, or even completely vertical, something else is wrong as well.
It was not good for the fans. The umpire should have let it alone after the second fault. But Such and Gardos should have been able to make the toss compliant with the umpires strictures as well. That they were not able to, and after many faults they were both actually tossing the ball in the same way they were before the first fault, to me, shows a lack of professionalism on both their parts even though Such was faulted far more than Gardos.
I remember seeing a match where Xu Xin was warned and then faulted and after he was faulted, the rest of his tosses were completely vertical and considerably higher so the umpire could have nothing to complain about.