Earlier quoted context omitted.
That's not how tenure works. Up or out -- you get tenure or you hit the road. So this is actually fairly common in academia. Sort of a parting shot, if you will.
Yes, but he's now trying to take his show on the road and get a job at another university. The reason this "parting shot" is risky is that it may get him pre-emptively ruled out by a lot of other hiring committees.
It may also prompt potential employers to look at the makeup of the department that rejected him - is it full of people who got their initial degrees when 32-bit architectures were theoretical novelties?