Well, I guess you could say that. However, it's more of a matter that Braga carred so little about lore of a show and franchise he worked for that he couldn't be bothered to keep things straight. In short Trek was just a job to him. So we have retcon things just to fix what he did. The same thing is going on with the introduction of a K'T'inga class D-7 into the time frame of ENT. Not to mention the tech of those Klingons is EXACTLY like the tech on Klingons over 150 years later. Then all of the sudden a pre-KBOP pops up in ENT. What the heck? The KBOP first appeared in SFS after the switching out of Romulans for bad guys infavor of Klingons. It was far cheaper to use the Klingon uniforms made for TMP then make new Romulan uniforms. At the time (1984) we rationalized this as a result of the brief Klingon-Romulan alliance from TOS. Ironically, the concept of that alliance was also a budgetary choice. The RBOP model disappeared, so the easiest thing to do in the Enterprise Incident was stock footage of Klingon D-7's and say that Rommies were using them. All of that is okay, until we get to ENT. It is then where all this lazyness on the part of Braga and some of the production staff, not all, that intergects late 23rd and early 24th century stuff into the 22nd century. This one of many things that irritate me about ENT.
To solve this, I go with the idea that K'T'inga, the pre-KBOP and the KBOP are leftovers from the time when the HurQ tried to conquer the Klingon. All these designs and technology are HurQ. When the HurQ came to Kronos, the Klingons were in their Middleages. Their culture has never really evolved beyond that. They are not terrible innovative, but they fast learners. They kill off the HurQ and take all their tech. They then use this stuff for a LONG LONG time, until the come into contact with the Humans. Sometime before TOS they aquire some Star Fleet ships and technology. They begin to engineer their own ships based on the model left by the HurQ, but with the innovation of the Federation. This is why the TOS D-7 looks like it does. Eventually, they return to the kind of ships they have been using and buidling for a long time. This why we begin to see the K'T'inga and KBOP pop up again during the TOS-film era. It's a stretch, but thanks to the bunch running ENT ( by that I do not malign the hard woking kids on the art and design staff ) this is what we are left with.
By the way, it's DS9 that provides a fix for all of this. Thanks Ron. Wish you'd been running ENT.