Ironically, it's not PSG, they refer to Bundesliga and Ligue like that because they mainly have one team, PSG and Bayern that is completely dominant, and it has no depth, which to be fair is a bit true since Ligue 1 has at most two other teams that do play.
France has one CL winner, Germany has 3, England has 6! Spain has is also worse than Germany with just two teams ever winning.
So, despite not being nice, there is still bit of truth about it!
La Liga has two big teams Real Madrid and Barcelona that dominate it in many decades and they win many titles in Champions League too. Generally La Liga have high competitiveness than Bundesliga and surely Ligue 1, and it is one of most exciting leagues in Europe.
In total clubs have ever won Champions League from a domestic league, Premier League can be the best, as I am not sure that Serie A has 6 clubs ever won this title. I only remember about AC Milan, Inter Milan and Juventus and not sure there are any other clubs have won it so far.
15 points behind Liverpool and with Liverpool winning the PL 5 matches before the end can hardly be considered doing well, at least in the last season they were only two points behind.
This not mentioning the fact that they might even lose the second or third place if they play like last time against Bournemouth
Their performances in Premier League are worse than two previous seasons, not better. If other big clubs don't have crisis, Arsenal position would be lower than 2nd like now. Even have good advantage from crisis of other big clubs, Arsenal still have risk of losing a second position in last matches.