Look we both know what you are doing.
You are working from PT and looking for some loophole to get away with it.
If you go and read the ruling, the LLC was taxed as a partnership and they found that it wasnt managed or directed from Portugal.
"
They found" means that it was factually true.
You can't get away by telling stories about you flying to US conductig board meetings.
The followup question will be "
oh really, can you please tell us who are the members of the board"?
At that point will be game over plus fatality for you.
Either you onboard a second fake member for your US LLC stating that he is doing the work or hire a manager for your LLC in a jurisdiction like
Panama or any other jurisdiction that's tax free like Monaco or simply doesn't care about your offshore affairs.
Your options depending on your risk tolerance are:
1. high risk tolerance: Manage your US LLC from PT and don't give a f**k about taxes, Andrew Tate style.
2. medium risk tolerance: Hire a manager for your US LLC
4. low to none risk tolerance: Singapore company managed from Malta