No, Joe, it means that it's only been played twice and both times white won. It's promising maybe, but not well tested.

And an isolated d-pawn appears, known for open lines for the player with the isolated pawn. It's already on the 5th rank, and white is better developed. It does look rather pleasant for white. Black hasn't made any obvious mistakes, but seems quite a bit worse here IMHO.

white's advantage is minimal at best

According to Akiba Rubinstein, the White isolated d-pawn can choose to become weak on d5, or stay weak on d4. A long term strategic liability, the isolated pawn shields a build up of attack behind the front line - or at least that is the hope. Here the thing is very well protected, and that might just give it the resilience to provide an effective bulwark whilst developing operations on a flank (probably K-side).

since the stronger player won both games that doesn't imply much of anything, since the stronger player usually wins. CH my DB says your move is best here,

This move tosses any advantage away. 15..h5 with a slight initiative for black for the first time in this game.

I would have gone - unsurprisingly perhaps - with Norbert Heck's move, overprotecting the d-pawn. White would probably want to keep his other rook on the f-file, or maybe bring it to the e-file.

CH this is an illusion, the b6 Knight doesn't really need the protection, and taking on c3 would increase white's advantage, and you may need f6 to be open

This is intended either to exchange on c3 leaving White with a hanging pawn couple, OR to pin the knight at c3.

Not a very pretty looking move though. If your knight could get to c5, that would be good, but that's a bit slow.

CH did you consider Bd7? also playable

wrong, much better is 19. Nf3 Bd6, 20 Bg5 with advantage

I think I would have gone for this as well - keeping lines closed around one's king is a natural thing to do.

20..gxf5 is better, example 21 Qc3 Be5