I'm not sure why you keep mentioning page-filing, because it's not really a problem if you're careful with your RAM usage and all you play is CS:GO.
He is having page filing issues even though he only plays csgo so yeah I keep bring it up. Being able to have more than one thing open at once is much more important that an ssd. I have family members who had laptops with 4gb of ram and even with have only one thing open it still used all 4gb so yeah I would say it's an issue even if they are just playing csgo. You are prioritising something that isn't all that important. It's nice to have in a build and would say if you had 8gb or ram then an ssd would be a better choice vs upgrading to 16 but that's not the case. Anyways the entire issue comes down to you trying to force the ssd idea to work when the ram upgrade simply makes sense from the start. They also said they want to play randbow 6 later as well and the sad won't do anything to help them do that. It's the last thing that they need as it is a nice thing to have but not nessisary. Having a certain amount of ram and a powerful enough gpu are nesisarry to run certain games. If they had a hierarchy of needs for computers, ram would be much higher in the list than an ssd. They need the ram.