Announcing declarations on Twitter is standard - welcome to the modern world, breh. Furthermore, he didn't just announce it on Twitter - he signed off on the disaster declaration and then the WH released a readout on the official WH website and other relevant government websites. Finally, Biden said that he would wait until it wasn't a burden on local authorities in Texas - that's what a normal and responsible president does. Planning presidential visits takes a lot of time, effort, resources and security measures (even more stressful now due to COVID).Announced the disaster declaration on Twitter and he's coming down here tomorrow after it's been 85 degrees for three days lol.
Biden didn't fumble anything.