Hmmm, I'm not hugely impressed with the standard of language on that site. For example (all taken from the page you linked to):
Difference between stative and dynamic verbs. This isn't a complete sentence and it wasn't used as a caption.
Hi there, welcome back teacher Harry here back to our English lessons ... Very poorly punctuated.
So we’re talking there, and something continuous. I have no idea what that's supposed to mean.