The Parkhead club lost their first league game for the first time in 24 years as the reign of Angel Postecoglou hit another precocious bump in the road.
However, it might have been different if Liel Abada’s strike, with a game close to 1-1, had not been ruled out for offside.
Greg Taylor was signaled by the linesman as he crossed the ball, leaving John Souttar to become the hero late in the day at Tynecastle.
While Stewart admitted on BBC Sportscene that the goal was on the line, he aimed for a poor Celtic performance against championship winners Robbie Neilson.
The expert said: It is a goal, there is no doubt about it.
Greg Taylor is on the line here. He is played by (John) Souttar and Michael Smith. It’s very, very tight.
“These incidents can go against you on occasion.
“It’s very unfortunate, but if they suspend everything on fringe decisions like this, I think that tells you all you need to know.
Ange Postecoglou said it himself. They weren’t clinical enough in the last third and they’re missing.
“Their starting XI, not to mention the team, needs to be strengthened. Enormous amounts of work have to be done.
“There is so much scrutiny, with every job you say; Postecoglou in his post-game interview talks about people trying to make things different from what they are.
“Well, when he says he hasn’t been forceful enough, these are things that can be interpreted in different ways.
“That’s what happens at Celtic if you don’t get results. “