"This is a wireless set for making a desk look interesting, not for typing quickly."
"Powerful & Reliable 2.4GHz wireless connection" translates to a single, convenient USB dongle for both devices, with performance perfectly adequate for web browsing but not the low-latency connection needed for gaming.
This combo is for someone prioritizing a specific retro aesthetic for their office setup on a tight budget. It's functional for casual use, email, and web browsing where style is more important than input performance.
Anyone who types extensively for work or needs a reliable mouse for gaming or design should look elsewhere. The non-standard keycaps and reported mouse instability are significant compromises for any performance-sensitive user.