@Wixomrie Sorry for the small delay. I poked around a bit more, then kind of got lost in a couple custom build sites, and it took me a while to wander back.
All of the computers I'm linking you would run Sims 4 on ultra. Any of them with at least an Nvidia 2060 should be able to run the game at or near 144 fps on ultra, at least at the 1920x1080 resolution of the laptop screens. So that's not a concern at all.
An i9 CPU won't do anything except heat up your laptop more quickly. All that power is completely lost on Sims 4; the game doesn't even come close to maxing out a 9750H.
Personally, I'd prefer a single large SSD to the dual setup, but everyone has their own preferences. The combination 500 GB SSD/2 TB HDD does narrow things down considerably though. I think your best bet would be to get a custom laptop, either from Lenovo (the only mainstream manufacturer that offers the options you want), or from a third party site that will add the components of your choice.
This Lenovo is the cheapest among the many options I could find. Configured with a 9750H, an Nvidia 2060, 16 GB RAM, a 512 GB SSD and a 2 TB HDD, plus the high-end 144 Hz screen, it's $1,415. It would take a while to ship, but that's not a surprise given it has to be assembled.
https://www.lenovo.com/us/en/laptops/legion-laptops/legion-y-series/Lenovo-Legion-Y540-15/p/81SXCTO1WWENUS0/customize?
The same configuration but with a 17" screen would cost $1,455:
https://www.lenovo.com/us/en/laptops/legion-laptops/legion-y-series/Lenovo-Legion-Y540-17IRH/p/81Q4CTO1WWENUS0/customize?
I checked a few custom build sites, and XoticPC was the only one I saw that has what you want and isn't overly expensive. For comparison, this is the same laptop you originally linked; with a 500 GB SSD/2 TB SSHD and otherwise the same specs, it's $1,453:
https://xoticpc.com/collections/advanced-series-gaming-laptops/products/msi-ge63-raider-rgb-1050
(An SSHD is a hybrid drive: faster than a conventional HDD but not much more expensive for the same storage. XoticPC doesn't offer HDDs.)
This MSI Leopard would be $1,560 with an i7-10750H (a bit faster than a 9750H), an Nvidia 2070, 16 GB RAM, and a combo 512 GB SSD/2 TB SSHD. It is a pre-order though.
https://xoticpc.com/collections/extreme-series-gaming-laptops/products/msi-gp65-leopard-10sfk-047
There are also a number of configurations of Sager laptops available. For example, this one has an Intel i7-10875H (somewhat faster than a 10750H), an Nvidia 2060, a 15" 144 Hz screen, plus 16 GB RAM by default; customizing it with the dual drives you want and adding Windows 10 puts the price at $1,371.
https://xoticpc.com/collections/advanced-series-gaming-laptops/products/sager-np7858dw-clevo-nh58ddw
The 17" version is $1,420:
https://xoticpc.com/collections/advanced-series-gaming-laptops/products/sager-np7877dw-clevo-nh77ddw
The version with a 15" screen and an Nvidia 2070 is $1,662:
https://xoticpc.com/collections/extreme-series-gaming-laptops/products/sager-np8358f2-clevo-pb51df2
I know these are a lot of links, but they're really only the same few options over and over, with slightly different configurations. Once you decide what hardware you want, things get a lot simpler.