Yeah, I hadn't actually seen the "clean" circle-A argument in relation to this particular bit of graffiti until now, but I had seen exactly the same baffling claim being made about a similar bit of graffiti last year, and had also seen people suggesting that this must be a false flag on the grounds that the graffiti writer's handwriting in general was too neat(???), so not entirely surprised to see it coming up here. The graffiti writer's views on Dr Who remain unknown at this time.
On a related note, I did once have a platformist take the piss out of me because my circle-As were too messy (not even intentionally, I just have crap hand-eye coordination). This must've been well over a decade ago, but as with the London Wildcat dalek-basher, some things just stay with you.