simplicitypvp.net

Unjailed.

That is correct. World downloading is allowed, but obviously using it to "xray" will still get you banned.

Unjailed.

You were jailed for xraying on the 12th of July 2019. That explains the full gear, at least.

There's been some issues with lag and server crashes recently, you probably just tried to login at one of those times.

You were already jailed for xraying.
Jail and Ban are equal punishments on our server, and since you were the only person online who might have been causing the lag, I decided to change your Jail to a Ban.

Yes, the amount would be pretty irrelevant, it's just that he seemed to be implying he "never even dug any diamonds" in his original appeal, so I wanted to make it clear we know exactly what he mined.
His tunneling was indeed very obvious.

If it's not too spammy, yes. The afk thing would be totally fine, a message every ten seconds would be pushing it.

You may appeal for a second chance one year after the date of your jail, which was the 20th of April 2019.

His IGN is Big_Bloxxer.
Over the course of ten days, you have mined 161 diamond ore, but as you said, you also used your xray to find coal and redstone.