Does Jhin legend ability count Repeat costs as total paid or what is written on card?

Yes, the energy spent on Repeat costs counts toward the energy spent to play the spell for the purpose of triggering Jhin, Meticulous Killer's legend ability.

According to RiftJudge FAQ #10012, when you play a spell with the Repeat keyword, you pay its base energy cost plus the additional Repeat cost. This total energy spent is what Jhin's ability checks to see if you have satisfied the requirement of spending [4] or more energy to play a spell that turn.

Because Repeat is an optional additional cost paid during the process of playing the spell, that energy is considered part of the total energy spent to play that single spell instance. Even though the card text only shows the base cost in the top corner, the game accounts for the total energy paid during the play process.

This is consistent with Rule 356.4.f.1, which establishes that costs paid during the play process contribute to the total energy spent, and Rule 820.1.c.1, which clarifies that the Repeat cost is an additional cost paid during the steps of playing the spell.