Not really no. When DCL played the ball the only thing to look at is if Siggurdson was in an offside position or not. He clearly was.
But that's not an offence. An offence only occurs at a point further on from that, in this case Sig being in De Gea's line of sight stopping him from being able to play the ball (in the VAR's opinion).
Guess you could say that when DCL plays the ball its Sig's position which is important. After that it's his action which is important. The 2 together make an offside offence.
Think of if DCL played a throughball for Sig to run onto behind the defence. When DCL played the ball Sig was in an offside position but you don't get penalised at that point, he only gets penalised 20 yards later when he interferes and actually touches the ball. Or in this case Sig is in an offside position when DCL shoots, but is only penalised when he interferes by being in De Gea's line of sight as the ball hits Maguire.