I noticed that, but 'suggests' and 'is' are two different things. It likely won't matter, since most DMs will likely go along with the intent.

I was going to bring up a different (Su) ability that uses 'no longer', but all examples of such transformations I can find are extraordinary. There are (Su) effects that are permanent, however, and those still fail without magic.

I can find an example of abilities that are not entirely (Su) - some of the epic warlock feats. They specifically note "This is an extraordinary ability" for the parts that are extraordinary. Noting "This transformation is an extraordinary ability." would close any nit-picking of the capstones. I have played under DMs that would nit-pick that capstone. :P