I understand the scepticism, but without links of what you've found or which parts in particular you consider dubious claims (ram speed can be increased when soldered, higher speeds lead to better performance, etc) it comes across as "i don't believe you, because i choose to not believe you"
LTT has made a comparison video on ram speeds: https://www.youtube.com/watch?v=b-WFetQjifc
Do you need proof that soldered ram can be made to run faster?
In science, especially math, all the famous scientists lived long ago. Newton, Euler, etc.
In computer science only the very pioneers are dead already. A lot of groundbreaking work was done by people who are still alive, or even still in working age.
It's so weird!