In my opinion, it's a rumor that will never come true, so just ignore it.
Ronaldo will not return to Manchester United just to prove that Ten Hag is a coach who has made mistakes in his career. He didn't have a great season with Ten Hag and that can't be denied, but Ronaldo is a great player. In the SPL, Ronaldo shone and he seemed happy to be there instead of returning to Europe.
I have the same opinion as you about the Cr7 and Man United news. Well, it's just a rumor and it's better if we ignore it because I also feel that Cr7 will not return to a European club. I think he wants to spend his last years as a football player here at Al-nassr. Because I think Cr7 is currently quite satisfied with just playing for Al-Nassr and defending the Portuguese national team. In fact, the news I heard was that Cr7 sometimes invites other star players to come to Arab clubs, especially Al-Nassr. Although maybe it's just a rumor, I'm sure there will be more European star players coming here.
At the age of 40, his body is good and performance are also not bad at all but for me his chances for any top UEFA club is already ended because now it's too late for him to have any club specially as we have Manchester United where new coach is going to start his new job with many on and off the field issues.
Most chances we will be having extension in his contract for 2 years which are enough for him to have 1000 goals targets and keep himself fit for World Cup 2026 where Portugal needed his services again for having something good while they fail to do anything good in last few years Saudi League is having good improvement which is enough for having more good players from other leagues for their performance in this league in coming years.