That is an actual photo (though slightly distorted by someone taking a photo of their TV) of the VAR decision line.
As I said in the VAR thread, he was at most an inch offside via that assessment, if they actually selected the correct frame for reference. Even that is probably in the margin of error for the system.
That is not in line with the spirit of the offside rule or really what any reasonable football fan wants to see, even if it sometimes benefits their own club.
Those decisions are why people see VAR as detracting from the enjoyment of watching football.