Pre-change I thought Twemoji became closed sourced (source: https://emojipedia.org/twitter) and my repo observations (tons of open issues and no new commits) showed the same, but now I'm not sure. I think they probably resurrected a dead repo. Emojipedia hasn't said anything on their page about Twemoji (I checked before writing this post) as far as I know.
So the boys over at Twitter are just wading into this? Why make a statement this way? Are they going to change other flags when they see fit politically too? Change Venezuela's to the stars and stripes?
There are other ways to make statements. Add a hashflag to #freeiran or something, free of charge.
X is a tool of Western intelligence. The level of algo boosting for "the people of Iran are about to free themselves!" videos has been off the charts. JK Rowling and John Cleese are flogging it.
It's classic MindWar tactics of the sort that were pioneered by Michael Aquino. Convince the enemy they've lost before the war even starts.