Going off his IG Riley Peach currently training in some form at Atletico Madrid.
He trained with Atletico's Juvenil A squad (their U19s, top youth team at the club), currently coached by Fernando Torres - no small feat.
He and his agent are very close with the Ñíguez brothers, Aaron and Saul (Atletico, Chelsea, Spain et al), so to put a damper on things, wouldn't be surprised if this is simply a favour or an experience they've set up for him and his club (Club Costa City, ran by the bros).
Still very young (16 in December) and would be very disappointed if NZF didn't extend an invite to U17 training camps. Peach is also eligible for England and Bermuda.
Edit: Wow, so from the investigation I've done, looks like it indeed was a one-week training session with an eye to a deal. Great for the kid, fingers crossed it goes well