If I recall correctly, earlier iterations of the Dev Team claimed to consider the extended intro as canon, unless the current one has announced a different view on it I see no reason to think otherwise. As far as I know the concepts of the Suncrusher were taken from that intro, thus the later created Planetrcusher based on it's greater predecessor can also be originated from that.
I'm also pretty sure a quick search can confirm or deny any of these claims. I myself for sure consider the events of the extended intro canon, although they bear little to no relevance for me.
The destruction of sol is literally handwavium, though.
