The tweet in question (alternative archive link) was very likely sent from a fake account (although Twitter being what it is, this is unlikely to ever be conclusively proven either way). The account that seems to be her real Twitter (@Sashapanther93) has denied any connection with the tweet (and its message). In addition, the same thing was said by the Taking the Initiative Party where she is a member of the Executive Leadership Committee, as reported by Insider:
The party said the account @SashaJohnsonBLM was "not created by Sasha" and was "created to persecute her."
On Reddit, green_flash's comment outlines some other points:
- If you google sashajohnsonblm which is the account name used for that tweet, there is no mention of it before Aug 26, 2020 at all, no other tweet, no link, not a single outraged reaction. Seems unlikely.
- She doesn't use the "blm" as part of her account name on any other platform, on Instagram for example she's thesashajohnson. The "blm" in the account name is very useful for propaganda purposes against BLM though
- The profile image used for the account seems to be this Shutterstock image. Would she use a stock image as her profile image? Seems unlikely.
Not definitive proof, but it means that anyone could have gotten the image.
And this is what they said about the account that made the tweet:
- Describing herself as "Oxford Black Lives Matter Leader" which she never was, she just spoke at BLM rallies in Oxford
To call her any type of leader at Oxford BLM seems to be an exaggeration. Neither their Instagram nor Twitter ever mentioned her as far as I can tell (not even after she was shot). The Instagram or Facebook of "the BlackLivesMatter Global Network Foundation", for example, describes her as "an ally of BLMUK" — she's apparently not even a member there.
- No activity except for a flurry of racist tweets on a single day and a retweet of an old white man with a Hong Kong flag in his profile criticizing a self-described socialist journalist - yeah that's totally what a BLM activist would do
As I understand it, the account was live for a number of months and had more activity (75 Tweets) than what can be seen via any archive I've found. Still, it was not well known before.