Someone else pointed out that "the law" is shorthand for "how the police behave" and that has certainly changed because of VP Trump's statements.
A) Behavior and statements are different things.
B) Biden also said he wouldn't enforce the ban (and also, it was the last day of his administration, so enforcement by Biden wasn't even possible)
This was a political gift to Trump, as the messaging in TikTok's app makes perfectly clear.
Police behave how government leaders want them to. Government leaders changing their statements changes the actual behaviour of police.