The PC64 isn't mentioning if it includes a C64 emulator. Which you can download for free (Includes C=128, +4, VIC20 and others).
Going to the Commodore site... its very amateur. Not sure how legit they are.
It doesn't take much to make a site function and look pro... especially if they had the funds to purchase trademarks as they don't seem to own any actual Commodore technology rights (what is the value of 30 year old technology?)
Hell, people have bought one of those JOY-STICK game conoles (you know, play actual Arcade or Atari 2600 games on your TV for $15) with C=64 games on it, took it apart, attached a keyboard to it, and manage to turn the SOC 2" square thingy into a somewhat functional C=64 computer.
Then again, my MAC emulator for my Amiga was only 80k. 😉