This is fake news.
There will be hardfork of Sia in approximately 6 weeks (at block 139000) to correct a bug in the latest Difficulty Adjustment Algorithm. But it will not be an "airdrop" as it will not be a contentious hard fork: all the users, exchanges and miners will adopt the new consensus rules (included in the upcoming 1.3.1 release), so the legacy blockchain will be abandoned.
Please, stop spreading confusion among users and cite your sources whenever you announce something as important as this
Good thing that there's someone who cares about the people who wants to invest with this coin, fake news will bring fake pumped and it will harm
the project when people will lose their investment just because pumpers wanted to take advantage, its really important to know the coin that you
are willing to invest with before doing any actions.