Answer:
Canceling Soco does not remove or change the TAP links on any videos you already posted. If you override your Soco link with a different link, then that link applies to future videos that you post.
When you post a video using a Soco (TAP) link, that video becomes permanently connected to that TAP link.
Canceling Soco does not disconnect old videos from their higher-commission link.
When a TAP link on an old video can change
A TAP link on an existing video will only change in two situations:
The TAP campaign ends (controlled by the brand), or
TikTok itself removes or updates the product link for reasons unrelated to Soco.