I do have a WSP80, and there is no magnet in them (WP80 has a slightly shorter tip-to-grip distance). Tips just butt up to the heating element, and are held in place by the tip retainer (metal tube w/ plastic wheel with an embedded nut).
FWIW, I purchased additional tip retainer tubes (faster tip changes & less likely to get burnt), and even though they're genuine, they're not identical (Bosnian v. German made). I'll let you figure out which one has the best fit, but both do their job.
As per copies, I've seen there's LT series compatible tips coming out of China sold on eBay (
example), but I can't recall if the packaging tried to insinuate they're genuine Weller or not.
Sorry the link doesn't have photos of the packaging, nor did I take any photos of that mine came in.
Plato also offers LT compatible tips made in Costa Rica if you need/want an alternative source. I've tried them both, and they do work.