How to release rear center shoulder seat belt on 2018 Dual Cab?

Just got a 2018 Dual Cab Tundra.
I have a seat cover for my dog and need to run the bottom pivot point through the hole in the cover. To do that I need to release the shoulder strap from the anchor (at the bottom - where the back meets the bench) and then reattach it after threading the female part through the seat cover. How do I release it? I’ve had cars that used the seat belt male piece to press a button in the side to release them but there’s no such opening on this buckle. But it definitely looks like it’s intended to release from the buckle.

 

Bump...
Anyone have an idea on this?

Thanks

 

Can you remove the seat and unbolt where it’s anchored?

 

I suspect I can do that. My hesitation is around the need to sometimes remove the seat cover. It’ll stay in most of the time as my dog is the primary back seat passenger. But if have any passengers who will ride in the back - especially if they don’t want to be covered in dog hair - I’d want to remove the seat cover. Having the seat cover essentially bolted in place will make that quite difficult.
The design of the anchor sure does seem like it was designed to be easily released. I just don’t see how to do so. I’ll call the dealer today to see what they say.
Thanks for the suggestion, though.

 

This is resolved (sort of). Ended up going to the dealer and after watching no less than 4 sales guys there head to the truck with key in hand (ready to release it - as it used to have a slot on the side of the buckle for releasing) we finally drove it into the service area for a mechanic to look at it. He was also stumped at first but tinkered a bit and slid a tiny screwdriver into the seam in the plastic housing and released it. He (like me) thinks it sure is a poor design. It’s as if the wrong plastic cover was used.
Here’s a pic of a screwdriver inserted into the seam at the right spot - although it’d be better at more of a right angle. This screwdriver is a bit thick and would foul up the plastic after a while. I’ll be getting one of the pen-style drivers the mechanic had. Hope this helps others.
I did see some threads here and there about drilling out the plastic cover to expose the release button. I may do that but a, lot ready to do so on my truck with only 150 miles .

 

Awesome. Glad there was an easier option

 

confirmed, it works. i used a 3mm slotted driver and worked open from the metal bracket with less marring. I drilled a 4mm hole on the passanger side. (the hole ended up being a bit big).

 

I used a thin sewing needle held in a pair of pliers through the passenger side seam and it popped right open. Too easy.

 

Thanks for the answer. I was stumped also.