After Liverpool performed so well in the group stage of the UEFA Champions League competition, a lot of people believed Liverpool was the favorite to win the UEFA Champions League trophy because no club's performance matched that of Liverpool's performance, so it's normal for your friend to boast that Liverpool will win the UEFA Champions League trophy.
You're right anyone can harbour such mindset that Liverpool was going to win that UEFA league for last season considering there performance from the group as you said not even only that, as that time, the same Liverpool was excellently doing well in their domestic league too which was also a yastuc anyone could use to validate his or her assumptions to this effect but unfortunately they weren't able to achieve that, I think PSG prioritized the UEFA champions league games last season because for me I never thought the will qualify they were to face Liverpool although they got lucky but that was because Liverpool weren't seen as a serious team in the second leg of that match although that's now history.
Nobody believed PSG would beat Liverpool in the Uefa Champions League last 16 because PSG struggled in the group stage of the Uefa Champions League competition to reach the last 16 when
PSG have won the League and UCL this season. They are in perfect form in Ligue 1, with only 2 defeats and a huge point gap from 2nd place Marseille. It seems that they will not make many big transfers. It seems that Enrique will only add a few players as a strategy for the tight competition. But it all depends on the condition of the players who leave. I think many players will get new offers from other European clubs because of PSG's good performance. One of them is striker Goncalo Ramos who Man United want.
Source:
https://www.mirror.co.uk/sport/football/transfer-news/bruno-fernandes-already-given-green-35340372They will not make any player transfers if it is to win Ligue 1. PSG really dominates in Ligue 1 and I think they will still be champions again this season. But I think PSG must still make some transfers such as to regenerate players or get young talents who have not been glanced at by other clubs. And with their impressive performance I think there is a possibility that some PSG players will leave the club because they get offers from other clubs. I think these are some situations that show that PSG cannot just rely on the same squad as this season for the future of the club. They will compete in the FIFA Club World Cup this year. And now they are one of the favorites to win the UCL. This is a good momentum for PSG to maintain the depth and quality of their squad.
Nobody believed PSG would beat Liverpool in the UEFA Champions League last 16 because PSG struggled in the group stage to reach the last 16, while Liverpool was on another level and they could beat any club they met. When Liverpool beat PSG in the first leg of the UEFA Champions League last 16 matches, most people believed that it was over for PSG because they believed PSG couldn't travel to Anfield and beat Liverpool. But PSG surprised everyone in the second leg of the UEFA Champions League last 16 matches with an impressive performance and beat Liverpool, which nobody imagined would happen.