Hi Adrian,
For me, at least, that helps a lot.
I agree with Curtis Judd about loudness levels for the kinds of videos that you make. On a personal note, I've made educational videos for YouTube at -20 LUFS, with a Loudness Units range of 6-7LU, that have been well-received. For me, the Loudness Units range (which is basically dynamic range) comes first. I don't like what happens to the spoken word with more compression. That said, at the end of the day you have every right to make your videos at -14 LUFS if that's what you think serves your audience. However, I think that if you analyse the audio of successful channels making the kinds of videos that you're making, you'll discover that the audio for those channels is below -14LUFS.
I think that it's important to distinguish between regulatory broadcast standards for loudness and what's happening outside broadcast. YouTube's -14 LUFS is essentially a "sort of" maximum, not a standard. It also isn't true that all the platforms are the same. Apple Music, a major player in both music and podcast, is at -16LUFS and takes it seriously.
There's a simple, practical reason why YouTube doesn't have an actual standard. Most of its users don't know what loudness is about and don't have the tools needed to abide by a standard anyway. It's completely unrealistic for YouTube to have a loudness standard. That's why there are YouTube videos that you have to strain to hear, and videos that suddenly assault your ear drums.
Blackmagic has video material that talks about the Fairlight meters. There may be other videos, but the one below starts talking about the meters at around the 56 minute mark. Note that level metering and loudness metering are not the same thing. I don't know how Fairlight works, but on the applications that I use, level meters and loudness meters are different meters, and there's a process for setting an integrated (i.e. average) loudness level. If I recall, Curtis Judd talks about that process in the follow-up video that you watched, albeit with a different application than the one that you use.
One final comment before the video. Many people make good YouTube videos, including with respect to their sound levels, without using loudness as a measure. LUFS can be helpful as a tool, but it isn't necessary for a platform that doesn't actually have a standard. I suspect that most people who make YouTube videos are not using this tool. There are other approaches to setting levels for YouTube, and a good number of videos on how to do it.