As Derby showed you can pull a number out of the ether. As Man City show every season you can make up bullshit sponsorship agreements. More teams get away with this than get their fingers burned
Bournemouth don't have a potential stadium sale to fall back on though, so the Derby situation doesn't show anything. Like Aston Villa, Derby had a stadium to sell in order to counteract the EFL's P&S rules. Sheffield Wednesday were charged for the same breach, but again they had a stadium to sell in their attempt to try and cover their losses. As I've already stated Bournemouth's stadium isn't owned by them.
It's significantly harder for Championship clubs to inflate sponsorship agreements to the extent that those in the Premier League do....so I highly doubt that option would be their saving grace.
The point isn't whether they'll be charged by the EFL for financial misconduct though, as P&S rules won't kick in after 3 years (4 if the recent changes are made permanent). Plus they're highly inconsistent in giving out punishments. It's whether Demin will be willing to continue pumping tens of millions into the club in order to keep it afloat. Personally, I wouldn't be all that surprised if he eventually refused - which is an issue for the club as in its current state it's unsellable.