I remember reading about how Venezuela had an internet blackout preceding US attack, presumably the blackout was an attack by US "cyber". Ah, here we are. https://securitybrief.co.uk/story/us-cyber-attack-on-venezue...
The discussion here assumes that the Iranian government is responsible for this blackout. I actually don't understand enough about network routing to undestand the OP dashboard linked to or be able to answer this question, but could it instead be the work of an opponent preparing to attack Iran?
Iran has shut down the internet nationwide several times before, this is nothing new when there are protests.
Seems more likely that an authoritarian regime is suppressing protests. Unless there has been a troop buildup of which I am unaware, there's no imminent invasion.