this news impact price of bitcoin ? if yes, then may be they transfer coins from other wallet to pump bitcoin significantly and dump on high price (just a random thought but, before this tweet came out the price also risen up maybe they bought in real)

many times they tweet about new purchase of bitcoins.

it's nice they are DCA ing and now the average price of buying is ~$29000,  they started accumulating in 2020 (https://buybitcoinworldwide.com/microstrategy-statistics/) and they also bought in bull run when bitcoin was very expensive. and not average price is very cheap.
that's the power of DCA,