Aren't you the guy that emailed me? Sorry I wasn't able to meet up with you at startup school.

I still don't think its that dangerous of advice. Sure, if somebody is working in a similar industry, doing actual work on the start up in the work place, then that'd be a problem. Businesses often do have large portfolios of IP, many having not much to do with their business, but I don't think somebody is going to have a problem working on something totally different, at home, on their own machines, on their own time.