I would say yes in a heartbeat. Would I then make such a noise about being bootstrapped and profitable? Not so sure. Pretty certain I would add a * with an explanation every time I mentioned bootstrapping.
But is your version of events correct? I've never seen the story myself on a 37Signals post.
I think bootstrapping means 'we didn't take any money before we were profitable'. I don't think taking money later counts, and certainly they didn't take any because they needed to expand or anything. I don't think they need to put any caveats. 37s existed for years and years, with their own web applicaton products, before Bezos came on board.
Boostrapping doesn't necessarily mean you never take money. It means they go off the ground running and built a business that was profitable without taking investments. After it was profitable for years they took some money (I have no idea why at this point).
But is your version of events correct? I've never seen the story myself on a 37Signals post.