Well you aren't faking it if you've learnt it are you?
Sure, you might be considered better at working out by ear a bass line, if that's what you do.
Doesn't mean you're a faker if you don't do it like this IMO.
A bass player in a band is only ever required to learn a song.
Whether that be by charts,tabs,videos or ear makes very little difference, as long as you can play it!