That is a questionable definition of "popping" a bubble.
The article does go on to admit that it's just selectively illustrating the number of deals, not the amount invested in seed deals, which is actually still the same in aggregate, and then wishy-washily says it's up to you to interpret this yourself etc. But since most people don't read too far past the dramatic chart and the headline, I think it would be fair to say this smacks of click-baity sensationalism.