You'd have to try it and see what happens, unless someone else has used it under those conditions and can answer...

The thing is, TTTF is really traffic sensitive until it's well established, so you really have to be able to withhold traffic until it's well on its way to being established, next Spring. This is what the pros recommend: https://sturf.lib.msu.edu/article/2012jul8a.pdf

 

Here's an interesting real world test on "rhizomateous" TTTF. They tested 5 "rhizome" producing TTTF cultivars against midnight KBG. https://seedsuperstore.wordpress.com/2012/09/18/does-tall-fescue-spread/

The general gist is that the rhizomes are very short, so in real life it is tillering aggressively but not really spreading. It may outcompete other grasses in a small area, but it isn't going to go through and push out other cultivars in your lawn.

My take after reading that is that the RZ TTTF will probably reduce your need for overseeding, but it isn't going to self repair the way a KBG cultivar will.

 

I have a high traffic area under my swing set. The TTTF has died and the KBG has survived and filled in. I'm sure every situation is different but for high traffic I would personally trust KBG more than TTTF.

 

Don't expect much spreading if any at all from so called spreading tall fescue from what I read but I have no experience using it.