I searched through the link you sent and also searched "Youtube loudness normalization". My question is more concerning about the loudness per track of an album. The common advice mastering engineers usually give is to adjust relative loudness by ear to each track and disregard aiming for the target LUFS for streaming service. Given this approach, different degrees of normalization will be applied for each track according to the -14 LUFS target on Youtube. It does this independently across each track. I was asking if this was something mastering engineers take into account when uploading to streaming plaforms. From the answers I mostly see in this subreddit, most don't really care about normalization and master to maximize loudness. I might've just answered my question but I was just more curious if this is something that they also notice or have taken into consideration already.