Yeah, the 4th gen iPods only had the A4 series chips, which aren't powerful enough to run iOS7. Even though it was still in stores in 2012 (heck you can still get it on aplle's refurb site today), it's still a 4 year old piece of mobile hardware, which given most devices only have a "shelf life" of three years, makes it past it's prime.
FileMaker does list iOS 6 and 7 as deprecated on their deprecation info page for FM13:
But it apparently hasn't trickled down or been pointed out in the article you linked to.
But at least the 5th Generation iPod Touch supports iOS 7 and 8 and FileMaker Go. But I know it is frustrating to have to spend money on a new device when the old one doesn't seem broken.
Indeed, and it was more of a general heads up that the info is out of date rather than an outright complaint as I understand the need to move forward.
We have a solution that is used by schools, some of whom invested in a number of iPods 2 years ago, they would love some of the stuff we can do with 13 but are going to find it hard to upgrade their hardware so soon, at the same time FM Go 12 is getting buggy on iOS 8 due to the end of support from FM.
What WOULD be handy is to be able to detect the underlying hardware device model from FM Go - at least I could assess what our customers are using - unless this can be done already?
You can probably do it by scraping the data out of a webviewer or Insert From URL call if you’re familiar with those techniques.
This page covers the code fairly thoroughly:
and this article also helps: