SPAM is still a huge problem for some people but decent filtering means it isn't a problem for everybody. It's a problem for novice users who don't know how to set up spam filtering software and whose ISP doesn't do it for them. And it is problem for the ISP who has to filter it all out in the first place - we still pay for the bandwidth over which it arrives, we still have to let it take up mail server resources and we have to spend yet more time applying filters to figure out if it is spam (and some of these filters are quite costly in computational terms). The trouble is that SMTP just wasn't designed with spam in mind.
Ancidotally there is as much as of it about as there ever was.
And I can't see how CTL's approach helps. By all means have a spam trap which attracts spam, but how is that going to stop you getting spam to another account (not withstanding assuming everything received to the spam trap is spam and using that as a seed to some learning filter on the other account, which somehow I doubt is what he was suggesting)?