Did he lie? … yes
Did he have the requisite knowledge to know that he was genuinely lying? … yes
Did he lie to FBI agents? … yes
Was he lying in an effort to protect himself and/or others - or to impede an investigation? … yes
It does not matter that he may have thought that he was ‘among friends’ and that his lying would have had no consequence.
Think about it this way - you are driving down road - posted speed limit is 45MPH … you are doing 80 MPH … you see red Mustang parked in the lot of the local convenience store - on side of the road - it really really looks like your cousin Billy’s Mustang … so you don’t hesitate - continue zooming along at 80-85 … then lights and sirens come on - you get pulled over …
And the best excuse that you have is “…Oh…I didn’t even slow down because I did not think you were really a cop - thought you were my cousin Billy” ???
yeah that is an ironclad excuse