That is because he was treated like shit the moment Ole stepped a foot in. Rashford dislodged him as #9 straight away and Lukaku continued to play 2nd fiddle before earning his place back in the side. He scored 3 braces in a week (Southampton, Palace and PSG) but after missing a sitter the following week at Arsenal he was dropped immediately.
Ole can speak all about Lukaku's poor attitude and how he shouldn't be here but he was the one who created a scenario and allowed it to happen. Ole's immediate treatment of Fellaini and Lukaku told us few things which we didn't think a lot of, at the time. He got rid of those two as they weren't a 'United player', a term which had been bandied for years and years to describe those two.
Now, you have Ole telling us that we are a striker short and it doesn't take 'rocket science' to understand that. Funny, how days after selling Lukaku and Sanchez he was happy telling us how we have two young players in Martial and Rashford ready to score bulk of goals, and a prospect in Greenwood whose gametime he doesn't want to impede by buying a new striker... 6 weeks later we're going for the same 33yo striker who wasn't even on our shortlist until few days before the window closed
It's just clueless and shambolic management.