The guy who tweeted it Chuck Callestro never puts out news unless it’s already confirmed.
Since you asked here is another article about it.
https://www.businessinsider.com/gop-rep-6-planes-americans-stuck-at-kabul-airport-2021-9?amp#origin=
Your secondary source provides much more info than the thread Tweet source. I paused after noting Chuck Callestro is a self-described talent scout and booking promoter.
“We know the reason why is because the Taliban want something in exchange,” he added. “This is really, Chris, turning into a hostage situation where they’re not going to allow American citizens to leave until they get full recognition from the United States of America.”
Have Taliban made this demand in exchange for releasing the planes?