Uh, what's your gripe? The article clearly states that the colony was pivotal to American history for two reasons - 1.) For creating the log cabin and 2.) For being the only colony to not have been at war with the natives by choice.

The article even says why the colony suffered - lack of supplies and immigrants to the colony from Sweden. That even corroborates with your point.

And yes, imo those two reasons are pretty significant enough reason to remember that New Sweden existed.