Aubameyang - who came joint-second in the race for last season's Golden Boot - has been singled out for criticism after scoring just two league goals since signing a lucrative new contract last summer.
"We saw nine shots from the main characters – Aubameyang, (Alexandre) Lacazette, all of them – and every single one of them missed. Even though we beat Manchester United, it was telling.
"If I'm being honest, there's not many chances being created, which is why I feel so unfortunate for Auba.
"It's just a coincidence that he's signed his contract at this time and then the suits say, 'It's because he's signed his contract, he's clocked off'. We're not creating chances!
"We're not creating chances but I do not like seeing in a warm-up shooting session, people missing the target, and sloppy shots. All those things make you look into the team and what's going on."