So, let me get this straight.
Someone's miffed because, canonically in TOS: The Tholian Web,
the dedication plaque on the Defiant
bridge said "USS Enterprise", but that was retconned for ENT: In a Mirror, Darkly
Not quite. Someone is miffed because the Enterprise dedication plaque says "Starship Class" while the Defiant dedication plaque says "Constitution Class."
The Defiant plaque is illegible in The Tholian Web (as far as I can tell) but is seen in Enterprise: In a Mirror, Darkly.