Have you noticed how quickly he turned this question down?
Indeed. You'd think that for someone so keen to tell us about himself, he'd explain how he was able to just jump on a train to the West, but clearly not.
for a young man like him who had just finished studying at 'Polibuda'.
From what I understand, a young single man who had just finished higher education would have zero chance of going unless he was very well connected. The regime wasn't going to let someone go who was educated and would almost certainly stay in the West, especially with badly needed technical skills. Not to mention that his story simply doesn't add up - as you say, you didn't just go to the Radom train station and ask for one ticket to the West.
I think things did liberalise a bit under Gierek, but there was no way Gomułka's regime was going to let people go freely.
Still, it should be easy for him to explain how he obtained the passport.