I think maybe you saw it somewhere else,
@TheotherSteveS ? I just went through all eight sets of threads (40W/50W x Black/Silver) and checked every post, both reading through and double-checking with a page search for nickel (actually 'nick')
Can't find any reference to that feature. I did see a thread saying it looks basically the same as the Vapourshark clone, so I'm wondering if you branched off into another thread, maybe the new VS clones, and saw it there? Ditto there was mention of posts on Reddit, so maybe you found it there? (It wasn't linked though, that I recall, so that would've been a new Google.)
Can't be bothered to go searching more threads, in the hope you can quickly find it in your history tomorrow
Or if not I will look in more detail tomorrow.
Even in the absence of seeing the claims for it, I am feeling more confident that it has the feature. It's either that they're doing these new boards both with and without that feature, or it's that FastTech forgot to add mention of it. The latter seems more likely, especially as it looks like they didn't even mention the spring loaded 510 at first; it's listed now, but there's a lot of posts where people asked FT about it, so I'm assuming that info was added later.