Not after a bad spend... On a donation portal, for instance, it would link all sender's as soon as the receiver makes a spend that uses coins from many if not all at the same time. It's even worse if the receiver is constantly spending from the SP wallets.

For the donation example, I think it's only an issue if the the SP addresses are linked to their original public static address with a consolidation, otherwise none of their other silent addresses are linked to anyone. They might be inferred if they end up paying to a particular static address. But the more silent payments are used in the ecosystem then the less traceable it all is.