They used to be awful, and in 2009, they ran an ad campaign explaining as much and informing you that they’ve changed.
My understanding is that they are much better now, but I’ve not eaten there since then, so I’m not sure. Either way, maybe Domino’s Europe is only loosely affiliated and still uses the old shit.
My mom’s had people try to tell her that she only thinks she has type 1 diabetes because the doctors told her she does, and if she stopped believing them, her pancreas would start working again.