This is clearly completely anti-positional play with Ivanchuk violating a number of positional principles.

7. c5?!

This move is on the book but it is not played at the top level. The reason is simple - it is anti-positional as creates weak white f2-c5 pawn chain that can be easily attacked at any link.

8. b4?!

In the spirit of previous move and it would only make sense if white would have a time to proceed with queenside action which he cannot.

This is ordinarily how amateurs play, one would not expect this from a player as Ivanchuk. After this move white has no advantage at all and has to play carefully to avoid kingside attack by black.

8. ...Nbd7!?

Standard answer in QG but it temporarily puts black development in awkward disharmony. The problem will be resolved though before white has any chance to exploit it. Immediate 8. ...Nh5 is probably a better move which Grischuk will realize in the next couple of moves.

13. f4?

This is another anti-positional move, obviously in response to previous pawn moves. The score of weaknesses in white position are now glaring. The game is already positionally lost for white and only a serious tactical player could find resources to fight on. Ivanchuk did not.

Here is its solution:

32. g4 Nxg4 33. Nxg4 Rxg4+ 34. Kh1 Qg6 35. Qh2 Rh4 36. Rc8+ Kg7 37. Rg8+ Kxg8 mating

Ivanchuk: "c5 was an unfortunate choice, especially after my loss to Kramnik, it was a bad idea to play such pawn structure."

...Tiviakov: "But very natural, if you can close the center and complete development."

Ivanchuk: "After game against Kramnik it is impossible to play such structures"... Ivanchuk vs Kramnik, 2013 0-1

<I refuse to criticize his play.> questioning a move or two is allowable

<Every move he makes seems okay to me.> This could magically change overnight if you get yourself an engine!

That sums it up nicely. Creating pawn chains is only a solid idea when :

A. you have a space advantage and your opponent has opposing pawn chain. B. ***the position is blocked.***
[As Tiviakov says: <But very natural, if you can close the center and complete development.>]

This is not the case here.

There is no other reason why would a player intend to create a pawn chain. They are always weak, they are always possible to break. Pawn chains are very often in amateur games and fairly rare in master games.

I think he is probably the only top level GM that does "experimentations" during supertournament play. It has been a major characteristic of his play and he lost many games that way.

Perhaps he simply loves chess and likes to experiment but he gets also very depressed when losing which it seems to be contradictory.

I've seen Peter Svidler playing conceptual experiments sometimes but he does not get so depressed when losing and his "experiments" do make more sense in general.

It is possible that the move c5 could suffocate Black but for some tiny fatal flaw somewhere, and that Ivanchuk intended some plan which had a flaw, a flaw which he saw too late.