they probably can, an inch at a time. With rollers and grease and chains.
The stones were transported overland after being quarried. The fact of moving them itself isn't the strange part, it's moving them through that enclosed a space and being able to make 90 degree turns. You can see how tight that is, they weren't doing the sofa geometry trick of standing it up on its end to make the corner.
To me the odd thing is they don't find scarring in those tunnels. I mean odder. It's all odd. You can't blame erosion, those are dugout tunnels. Someone might have had a project to come back after the stones were moved and smooth the tunnels, but you'd the evidence of that as well.
It's a legit mystery.