This decision was a joke. How is it decided where the respective lines are placed when it comes to checking this 'offside'? Move either one just slightly in either direction and you get a completely different result. I would also ask why is the blue 'defender' line only taken up to his knee? Take it any higher and you can see that it intersects his arm just as it does Pukki's. Naturally the line for the defender will intersect his knee first as he is not leaning as Pukki is, but what this camera angle/position does not take into account is the angle that Pukki is leaning. IMO Pukki's body is twisted as he leans and the lines as shown by the VAR don't take this into account, thereby presenting a falsehood. Here are some comparison stills with lines slightly altered to make this point:
1. Pukki's line moved slightly to the left to account for his body angle:
2. Both original VAR lines and two new lines:
3. Pukki's new and original lines, with the defenders line extended so you can see it intersects his armpit as does Pukki's original line:
4. The original VAR lines, with the defenders line extended so it intesects his armpit as does Pukki's original VAR line.
I think this shows what a fallacy (farce) the whole VAR circus is (when it comes to offside's at least).