That is the opinion of former Palace manager Sam Allardyce after the Reds beat the 10-man Eagles 2-0 at Selhurst Park.
Liverpool went to Palace having watched Premier League title rivals Chelsea, Tottenham and Manchester City win over the weekend.
And they finally made the all-important breakthrough moments before half time as James Milner dispatched a penalty, won by Salah, with aplomb.
Sturdy Palace defending kept Liverpool at bay after the break but their task was made harder when Wan-Bissaka saw red.
Wan-Bissaka was sent off in the 75th minute after Oliver adjudged him to have made contact with Salah as the winger went through on goal.
But Allardyce, who most recently managed Liverpool’s rivals Everton, isn’t convinced Oliver knew for sure that he was making the right call.
“Does he really know that he’s caught him there? He can’t,” Allardyce told beIN SPORTS.
“He can’t know that he caught his leg at all with his position so he’s guessed.”
Liverpool made the most of Palace being a man down late on as Sadio Mane secured the three points on the break.
Allardyce’s England predecessor Roy Hodgson, who now manages Crystal Palace, was in no doubt about Oliver’s decision being right though.
“That’s ok, he catches him, I don’t think he means to, I don’t think he’s trying to pull him down, but there’s no doubt there’s contact and he’s the last man so the referee made the right decision,” said Hodgson.
“We were chasing the game, they caught us on the counter attack, he was the last man, he did his very best to rescue the situation, he was very close, in another game he might have got a toe on the ball and he would have saved us from that situation, so I don’t blame him at all.”
However, Hodgson was unwilling to comment when asked about Palace defender Patrick van Aanholt flattening Milner.
“Yes, this is typical TV stuff it’s all about making me some sort of villain because you’re asking me what I think, I have to give my opinions but then afterwards it’s just a chance for you to go and ask another 30 people and get different opinions,” fumed Hodgson.
“Really and truly I don’t like talking about refereeing decisions.
“I can’t change them, they obviously irritate me, they obviously anger me when it costs the team points.
“But I’m just like every manager up and down the country, from Sunday League to the Premier League.”
Liverpool will be looking to build on the win at Palace when they play host to Brighton on Saturday.