Only time will tell. But...
1) I think it's generally a bad idea to bet against
@Canon Rumors Guy when it comes to his sources on camera and lens releases. There have been many times in the past when I thought he was dead wrong and was in fact spot on.
2) I don't think any rational person believes Canon will replicate the broad lineup of APS-C DSLRs. That ship has sailed and the market has changed.
3) If you are suggesting that Canon might come out with an R7 that is "the entry-level APS-C gateway to the RF system" I disagree. Canon is pretty consistent in their naming conventions, so an R7 is unlikely to be an entry-level anything. But, more importantly I don't see the viability of any "gateway" APS-C camera. It's debatable whether or not such a gateway ever existed, but if it did, that was another era. In today's market I see budget cameras (budget being a very loose term for cameras under $1,000) for consumers who buy one camera every 10-20 years and use it until it breaks or becomes so old they decide to replace it with a newer model. They aren't likely to "move up" to full frame and most don't know or care that there is a difference in the sensor size.
4) Then there is the enthusiast market, which is the only viable high margin market that exists anymore. That's the market that an R7 would target. Specifically, bird and wildlife hobbyists who want reach and quality and are willing to pay for it. You don't believe such a market is large enough to justify an R7. Others believe it is. No one but Canon knows, but if I had to bet, I would bet that such a market does exist and that Canon can pretty easily satisfy that demand with a R7 based on the R6 body coupled with updated sensor and dropping the mechanical shutter. I think that market can absorb a $2,300 to $2,700 price tag. For many it will be a second body that serves as a lower cost alternative to an unaffordable and unwieldy $12,000-plus big white. (Although, of course, Canon's strategy would be to sell people an R5, and an R7 and then wait for the buyer to decide that their never-ending quest for reach can only be satisfied by adding a big white as well. An R7 is more of a gateway to a big white than a gateway to a full frame body).