After about 3 hours of investigating hundreds of CoreProtect data, I have found out that everything Jrcute says is (seemingly) true.
I'm not sure what you're trying to show with the first set of screenshots of his house, if you're referring to the amount of gold blocks, he does have a gold farm and anvils are easily bought in the spawn shop.
His gold farm, about half of the spawners were placed by other people, not just Jrcute. Multiple people frequent the base.
For the pickaxes, I tested it myself and traded with a Toolsmith villager. I got over 2 double chests of the same pickaxe and could still continue to trade and buy more. (Costed 2.6ish stacks of Emerald blocks with it costing 14 emeralds each, which is very cheap). I couldn't find Inmortal's villagers (he has so many claims), but the pickaxe's enchants are common among Tool Smiths, and tbh who would dupe such a bad pickaxe.
As for the notch apples, they were added about 40/h ago, the spawn shop was changed and had that 2 grists -> 8 notch trade since 45/h ago. As the ss's below show, he took out large amounts of Grist before putting the notch apples and placing the hoppers and such. Which lines up to what they say happened.
As for the spawners, Supreme_Leader actually added a stack of spawners to his chests. Supreme_Leader lives with ShawnTheSheep, both of which have been playing for a while. (Atleast a month) Both Supreme and Shawn frequently visit Jrcute. Other than that stack, Jrcute has only been taking out and putting in 1-5 spawners when dealing with chests which is average among players. He did get 29 spawners out of a chest at one point, but that was from an old base that has since been removed (mined by players).
As for the beacons, Jcv does have a large quantity of beacons. After finding 5,300+ beacons within his home, I found a wither skeleton farm in his house (yes, i changed it to skeleton bc wither skeles aren't allowed in overworld) as well as storage space of 8 double chests for wither skulls (all empty though). We'll investigate further to solidify everything, but he's innocent until proven guilty.
Obviously I'm not going to post all the core protect data because that would take so much space and time.
Just because someone has a lot of items does not mean they are always duping. That is why they must be investigated and all the items tracked down to their origin. Only if the items came from illegal acts is when they can be punished.