The article as well as HITPOL8 [0][1]. WhatsApp has been blocked for the same reason Deepseek AI (the Deepseek app) is blocked - "Stewardship of Legislative Branch Data".

[0] - https://cha.house.gov/_cache/files/4/2/42dca19e-194b-481e-b1...

[1] - https://cha.house.gov/_cache/files/0/8/08476380-95c3-4989-ad...