N64 titles on DS were retro, SNES games on GBA were retro, Wii games on Wii U eShop weren't even ports, just ripped ISOs. The only example that applies is the Super Mario games ported to SNES but they only ported Mario, not the myriad of other titles on NES. Never before Nintendo ported so many titles from a console so soon after release.
Wii games on eShop is no different though the are even more of them than the ports Nintendo have brought on Switch.
LOL Nintendo put zero effort on the Wii games on eShop, it was no different than using backwards compatibility. It's nothing compared with Switch ports that have massive extra content.