You don't have to trust it, but you shouldn't be repeating it as actually being the case 10+ years later, especially when two of us in this thread have already said it isn't from first hand recent experience.
And all of this data should have an expiration date at some point for inactive users. Otherwise, current subscribers will be paying for the storage costs incurred by these companies years after the fact.
Its still a problem with trust, if Sony indeed has silently changed their policy on expiry of saved data. Because they havent admitted to or informed anyone about making the change, so they might as well change it back to deleting 6 month+ old saves again. If you havent admitted to anything, you havent done anything - right? So excuse me for not trusting them at this point, unless there is some kind of official statement on it somewhere. Im damned sure I read the fine print on the 6 month period expiry on their support pages back then. It was a thing, and Im not taking out of the blue. Its good if they have changed it, awesome.
As for your second point, I 100 % disagree and there should absolutely not be any expiry date on accounts or saved games when you are dealing with platform holders like Microsoft, Sony, Nintendo, Apple or MMOs and GAAS games like World of Warcraft, Fortnite and Call of Duty. I couldnt disagree more
I walked away from Xbox for 6 years or so 2010 - 2016 because I was bored with the whole HD console gaming scene, and focused all of my gaming around PC and Nintendo for that time. PlayStation as well, I kept my PS3 for a while but sold it some time after the X360 because I was bored with the PS scene as well after being a huge Sony fan from basically all of PS1 and PS2 era. Then I saw Forza Horizon 3 run on a console in a shop in 2016 or 2017, and couldnt resist getting a HD console again, and bought a bundle with the game and an Xbox One. And all of my purchases and saved games were still there, 6-7 years later without having been online with an xbox at all. As it should be, but it was still awesome to see that everything was indeed there after not having had anything to do with an xbox for so long. Same thing with World of Warcraft - I resubbed earlier this year for the first time in almost 10 years - and every little thing was there, in addition to all of the levelling boosts they have given out on battle net over the years. As it should be, when you have paid so much for the services and games and put years of your life into their games and services.