Starcraft 2 came out in 2007. These are the original system requirements. https://www.lifewire.com/starcraft-ii-wings-of-liberty-requi...
I remember receiving the game as a gift and having to tell my grandma that my single core PC wouldn't be able to play it. I think my PC was only 3 years old at the time, not even 6.
Blizzard announced they were making SC2 in 2007. https://en.wikipedia.org/wiki/StarCraft_II:_Wings_of_Liberty... there wasn't even a closed beta until early 2010.
Regardless, the minimum requirements you posted are single core CPU's.
* 1998: 32-bit, 500 MHz, single core, 128MiB of RAM IIRC (we later upgraded it to ~500 MiB). 7 GB of disk.
* 2007: 64-bit, ~2.5 MHz, dual core, 4, later 8 GiB of RAM. Hundreds of GB of disk.
There's essentially an order of magnitude improvement…