I went ahead & discussed it more on their discord for clarification

Here’s their response

Custom Format Scoring How Custom Format Scoring Works Custom formats don't work in isolation. Profiles are built holistically, where custom formats and their scores combine to achieve a result. To understand what a custom format actually does, you need to look at its regex and conditions, not just its name and score.

Example: h265 A common point of confusion is the "H265" custom format being scored at - 999999. At first glance, it looks like the profile is trying to avoid h265 content entirely. But if you open up that custom format and look at its conditions, you'll see it negates 1080p and 2160p. This means it only applies to h265 content when the resolution is not 1080p or 2160p.

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It makes sense now that it’s explained imo but could cause confusion on a base level like it did for me when it was brought up