So if it's Christmas season, reindeer cookies will show up way more often than golden cookies. Is this allowed in true neverclick runs? Or is it an unfair advantage?

christmas holidays has it's own leaderboard in the category extensions, like other seasonal events

https://www.speedrun.com/cclickermemes?h=Holiday_-_True_Neverclick-Golden_Cookies&x=zd3x53rd-ql67mvw8.p12e72d1

these are not allowed in the main leaderboard

which btw can be found in the rules of the game which you should probably read lol

btw you can also change your internal clock in order to get a different event or no event at all if you wanna do runs