Is this bad blockwork on extension

Hi

I went round to neighbours house the other day who is having an extension done and looked at their blockwork. I am no expert but it looked off to me.

He is a fairly old gentleman and I didn’t wanna say anything but just asked him about it and he said it’s being rendered so it doesn’t really matter

Any thoughts on this? Pic attached. The build is well advanced so I doubt he would want it pulling down.