I read through the first link you provided, it doesn't align with your claim "TikTok OBJECTIVELY collects far lesser data than Big Tech apps and services."

We go section by section

The companies collecting your face, voice & environment

TikTok is worst here, collection all possible voice, face, environment data

What can companies tell from image recognition?

Again TikTok infer as much information as possible, worst among all listed.

The later couple section did not mention tiktok, so I cannot compare it.

Finally

the 5 social media apps that know most about you

TikTok ranked number 3 in among all the social media, above clubhouse and twitter, just below facebook and instagram.