Can I use my orbi satellite as a bridge for my IPTV?

I am not familiar with viasat, at least in terms of fiber.

At first I thought viasat means: https://en.wikipedia.org/wiki/Viasat_(Nordic_television_service) but this is satellite.

Also puzzled about switching IPTV provider but not internet provider?

Are internet and IPTV provided by different companies?

It would help to see a complete description of "what is connected to what". and what mode the Orbi is in (router or access point).

Orbi can support IPTV for televisions wired directly to the router LAN ports.  See page 84 in the Orbi user manual:

http://www.downloads.netgear.com/files/GDC/RBK50/Orbi_UM_EN.pdf