At this point the method seem pretty thoroughly explained. At least, the first one 
Seems from most of the folks that have really tried to push something, topping out comes around 6-7 levels per hour at the high end, depending on personal skill/endurance and what you’re willing or able to spend.
The follow-on options available with your output are going to affect your overall progress a lot, too. If you’re in it for plots vs coins matters more here. Either way it’s a big part of your end results.
I’m pleased to see the numbers and comparisons - and it makes me happy to note that you can push various types of activities out to very nearly the same results (in terms of leveling).
The numbers seemed incredible at the time but I wonder if filling up some plots with lucents isn’t as fast or faster than the old method of breaking one block that got nerfed. I was so new then I don’t even remember what those numbers were for people. Same for the plant thing, I found out about it when they announced the fix.
Most of this here is “good honest work” even if it is, mmm, disposable 
I can see why someone would delete their vids but the devs have assigned those crafted block placement values after already having to nerf and adjust for several rounds of block placement and chiseling exploits. Together with the info here I see it lines up with other stuff - it’s surprisingly well balanced.
Similar for straight gleam mining, which has surely been overanalyzed and was last adjusted for coin, but not XP.
Together with the fact that you can stack furnaces endlessly crafting is definitely the pinnacle of “XP Over Time”. I had stacked up a lot of rough oort for my portals, refining when I needed it, so I never realized this but when I refined it all at once, it was one of the largest XP boosts I’d ever gotten. The hard part here though, is sourcing the materials. At least you can resell metals if you can get people to sell you raw ores.
The numbers on soil here seem a bit conservative for someone really pushing it. And soil is comparably cheap to farm. Overall that’s my main thought here, why I’m making such a rambling post about it - it seems surprisingly well balanced when pushing these activities all the way out to “sort of feels like an exploit” levels.