In the strictest legal sense, you could be sent a cease and desist order from attorneys representing the old or new record label, depending on which content is shared. If you got such a request, you would have a few days to take down (or make “private”) the particular content they call out as being their property.
Now, seeing as how Syn is clearly well aware of your page and has, in a sense, “endorsed” it; and since the band take an active role in their online presence, it’s unlikely a member of the band would engage the label to take action against you. It is still POSSIBLE, it’s just unlikely.
It is not fraud, because you make no representation of being a member of the band, or an official content delivery channel. In fact, the only person hinting that you could be considered an official content delivery channel is Syn himself, and he gave you permission to use the recording and clearly actually recorded it specifically for you. In that sense, it is no different, from a legal perspective, than Syn doing a radio station plug.
If your interest is in using the clip he provided you more frequently or in a different way than he originally understood when he recorded it, then drop him a private message asking if you’re free to use it more liberally. Ultimately, that recording is your property containing his likeness and intellectual property, so you both have rights. He can give you permission explicitly to use your recording of him for ANYTHING, if he likes, and even the label would not be able to say anything to you about it – they could only pursue copyrighted material (like The Stage vocal isolation track, etc) that they have rights to, as well.
If this is as clear as mud, don’t worry. That’s legalese for you.
DISCLAIMER: I am not a lawyer, I’ve just done up a LOT of legal documents for self and others over many years and can be anal retentive about word choices, which are kinda important in legalese. Advice given is most directly inclusive of the USA and US territories. Laws and contracts in other countries may differ. Ahem. Still reading????