I proposed something along these lines for each TeFo, but it seems it did not get much traction...
I see this argument going on for a while, even discussing the meaning of "instantly" (IMO, any dictionary would provide a clear definition), proving - again - that there is many ways to interpret rules.
I personally sees the debate between super-fast movement and TP as a way to get around the many requisit TP could require. Paraphrasing somebody, more possibilities, richer setting.
However, there is no guideline on how to infer speed for super-fast movement - I say guidelines, not canonical example. And trying to infer speed by doing some math based on round duration and distance looks dodgy at best and open a whole can of worms about closed space, obstacles, Finesse, etc.
Since we - for the Fan Grimoire - don't want to create new guidelines, I would rather that we stick to guidelines only, but we open the opportunity for additional spells as preamble in the TeFo paragraph, possibly quoting some canonical spells.