Okay, here is the thing , and i don't mean to boast or belittle Par Gerell , but i had a friend who could do serves pretty similar to this and he reached USATT 2200 and could have done way better if he could keep his cool on the table and be open to take a little coaching to fix his backhand unstability.
The thing is it gets to your head . I can bet that if Dan tried to return 10 serves again and all of them were with visible contact he would do worse than the first time , because after a while you start second guessing your own decision . And , the extreme side spin hides the top/under so well its practically impossible to tell unless you are very good at reading from the bounce and that too the second one ... what I have seen people successfully do is to play with extreme loose hands adjusting the angle at the very last moment .. whether you take it off the bounce or loop it light after letting it drop ... now god save you from the one that is kicking away from the righty's forehand , you would need very good footwork to keep following it and take it late and by the time you make it back you are essentially completely out of position for the third ball attack which could end up being a simple backhand down the line block ... essentially you pretty much cannot read the serve from the contact ... now is it hidden , yes this one is hidden . And pretty much every body who serves this serve ends up with a few that gets hidden, especially if its a opposite combination , lefty to righty etc. But what can you do ? I had asked this of one of the top coaches and the only solution he could give was to cheat on the footwork and try to get a glimpse of the contact ... unless ITTF decides to position additional umpires at the diagonals , there is no way you can fight this ...
? "Last time 3 was my lucky number, so lets go with 2 this time". Comment number 18 here:https://www.tabletennisdaily.co.uk/...in-a-STIGA-Carbonado-190-signed-by-Par-Gerell! I was not included in the draw :/
