Hello Mr. Scorpio, and welcome to the Pianoteq forum!
If one were to attempt an Elton John piano, we should start with the Pianoteq model Yamaha 9' Grand. I believe the specific model is a Yamaha CFIII. Notice in the video that the piano's lid is completely closed; this implies that the microphones are positioned on a crossbar that is inside the closed piano case. (There are commercial stereo microphone setups available for this very use inside of a grand piano whose lid is closed.)
The resulting sound comes from microphones being positioned extremely close to the strings (and quite possibly picking up noises from the hammers and piano's action). Any reverb you might hear ... must be generated by the person who mixes the sound in the venue.
Without creating an .fxp, myself, here are some first approximation suggestions to duplicate such an effect.
1) Choose the YC5 piano model by Pianoteq.
2) Close the piano's virtual lid.
3) Position two microphones "inside" the closed lid, placed either parallel to the keyboard, or perpendicular to the keyboard (in which one would be near the hammers and the other would be approximately 2/3rds down the length of the piano).
4) Reduce the dynamic range to under 20dB.
5) (Optionally) Raise the three hammer hardness sliders, such that they produce a harder sound.
Hope this helps.
Cheers,
Joe