It is the not totally bad idea that you understand a different perspective if you can reliably write pieces of text in such a way that somebody from that perspective cannot tell you don't hold that ideological position.
It fails pretty quickly when tribalism comes into play (aka do it a few times, conclude 'our side is better at passing this test, so we are better', ideologies being broad and people not always realizing which ideology they really are in/differences in definitions. And other issues like it is just a bit of intellectual masturbation, depending on finding neutral people of that perspective. 'you failed the intellectual turing test so we can ignore your criticism of our side'. 'You would fail an intellectual turing test so we can ignore you'. It being debate bro culture with extra steps. People are not actually interested in the test but use the test as an argument to bash people (you once failed at detecting sarcasm and misattributed a sarcastic joke from a leftwinger to the far right? This shows the entire left fails the intellectual turing test and should not be listened to). etc etc. /rant