He lays out Rebbeim's salaries in NY and it's a lot less. His main point is that people won't want to become Rebbeim because of the low salaries and we are missing out on talent. In Lakewood that's not an issue as there are tons of people looking for a job as a Rebbe and the schools are able to choose from tons of applicants to fill roles.
It's still a valid point though that at the current salaries we are short changing our Rebbeim by not providing enough for them.
Can't watch it , but if Lakewood rabbeim get only 45-55 then the schools can definitely afford to give them more.
You are correct though that in Lakewood the supply of Rabbeim is huge. There is no real market reason to rais them.
And btw, If giving the more cuts them off the ~ 60k value of gov programs and tax rebates it will be a big disservice.