It's a common tactic to give an opinion more weight. E.g. if you have an opinion that you need to push you need to add credibility to a claim so you find a figure or group to support your claim.
Obviously every fan "thinks" that United should be at the top of the pile, but a lot of the interview is just shit. It's a form of blame shifting to try and distract people from what is really happening.
The agenda is Ronaldo is a victim, and ETH has no respect for him [if only he would respect me then I would respect him back]. Then he's trying to bargain about the club standards and facilities which isn't the what the whole interview is about, it's about his shitty behaviour but as a narcy individual he needs to gaslight and bring people around to his thinking.
Every single fan and pundit knows about the under investment into the club. Neville even says about the roof of OT in every interview about the Glazers.
It's not about the facilities, it's about him having a huge drop off physically, being a passenger on the field and not even being in the top 100 players in World Football anymore.
He can start a radio show or do whatever he likes, it's not going to get him any closer to a trophy.
Ronaldo is actually screwing himself in this interview because no top club will want him.