When did I say that the chess program was different to a toaster? I don’t believe it is, so it’s not a thing I’m likely to say.

I don’t think the word ‘understand’ has a meaning that can apply in these situations. I’m not saying the toaster or the chess program understands anything, except in the limited sense that some people might describe them that way, and some won’t. In both cases that concept is entirely in the head of the describer and not in the operation of the device.

I think the claimed inconsistency is in views you ascribe to me, and not those I hold. ‘Understand’ is a category error with respect to these devices. They neither do or don’t. Understanding is something an observer attributes for their own reasons and entails nothing for the subject.