Is the Toyota frame rust not affecting the 2008 sequoia so much as the Tundra 2007 – 2008?

I posted this question but reviewd and realised it lacked some details.
I m writing from Norway. I have Toyota sequoia 2008 with about 97000 miles
on it. I have been checking and following this issue but most of the time it is
either a Tundra or Tacoma has has much rust.

My truck is in Africa. I made them to check the undercarriage and saw some
rust but I was told it seemed
to be a normal rust. The body shop brushed out the rust with a metal wire
mess. He then treated it with anti-rust and hardener. It was left for a 2 days to
dry and thereafter he undercoated it with truck undercoating - rubberlike
substance. It has been 5 months now. I am yet to let them check how it looks
like

My question is if the frame rust is more with Tacoma, and tundra. I am not
getting more infomation on the 2008 sequoia rust and how owners are
handling it.  Did I happen to be unlucky?

Attached is the worst plate which  was worked on and the whole chassis
sprayed with anti-rust and then topcoated with rubber