That's fine! That's why I posted that comment.
I guess that it hasn't worked for anyone else on this forum but it HAS for me, and the guy who posted the original comment on reedit. I have an iPhone 6 on iOS 8.3 (I think! Lol) and I tried it out yesterday evening with the alarm function several times. The alarm rang at a lower volume than my ringer each time. In fact, I left my ringer on maximum and had the alarm tone set a much lower volume - 3 bars, and the alarm went off at a lower volume this morning, unfortunately with the vibration as I had left that on(!)
If it doesn't work for you guys then I'm sorry but the fact remains that it has for me and at least one other person. Apologies that it doesn't seem to have worked for others but it does beg the question of whether anyone has tried to adjust the ringer higher than the alarm volume after unticking the option, 'change with buttons', through the volume buttons. I just don't understand how mine could be so different.
If they have then I'm sorry I couldn't be of more help.