The reason why Wyden is blowing his kazoo about this as a FARA "loophole" in need of legislative action is, I am sure, that even the Biden Department of Justice could find no wrongdoing by Jared. I am not especially a fan of his either, but his father's history of tax issues and other legal troubles leading to prosecution and prison time is enough to inspire great caution in ordering his business affairs.
Moreover, no matter the noise that Wyden may generate, a change in the FARA law is unlikely due to the same supposed loophole being exploited by Wall Street, by DC and a large swath of the country's political class and their families, and by so many elite universities.