Replacing Seat Foam for seats with airbags?

Hello TW

I am midway through removing my cloth seat covers on my 2015 that has airbags in the seats and I'm stuck :/

I am following HomerTacos guide (https://www.tacomaworld.com/threads/homertacos-diy-leather-interior.89333/ )
but his didn't have airbags. There is this white cloth strap holding the foam to the metal seat back that can't be removed unless it's cut.
This strap looks like it has something to do with the air bag so I am not going to cut it and would really like some input on how to continue.

 

UPDATE:

I didn't see that the plate attaching the strap to the metal seat back is actually 2 pieces that can be split after removing the bolt.

Now to figure out if this foam can be cleaned!
Previous owner was filthy