I don’t believe this is quite right. The Celeron wasn’t really a processor in its own right but a cheaper, cut-down version of a given Pentium type just with a standard name to make stuff less obvious.
Yeah the Core2x type variants didn’t help!
Also that Pentium in the middle you’ve got after ‘Atom’ is sort of three: Pentium M (for low-powered, long battery machines IIRC), Pentium D/EE and then two two “Intel Pentium” chips they did before Core in
You’ve forgotten the Xeon chips too!!