> Can you share evidence that US regulators are holding US-based social media companies to all of these same requirements?
This is whataboutism, but I'll answer anyway.
This article concerns the actions of a US governmental agency known as CFIUS.
CFIUS is not concerned with domestic issues, but rather foreign intrusions that impair national security: foreign businesses spying on US soil, foreign entities buying controlling interests in US companies and technologies, foreign real estate purchases near sensitive locations, etc. It is a regulatory body that can block sales and mergers and put a stop to such activities.
CFIUS wants the ability to audit TikTok so that it can ascertain the extent to which is or can be used to spy on US targets. From this data, they can themselves block certain business activities or recommend further actions to be taken by the government.