first : this is not how the tutorial told you to post the syscheck report. (but, ok, I downloaded your file to look at it)
second : I don't know which tutorial you followed but your setup is useless.
third, and the most important : I just notice you are on WiiU and not Wii ! but you posted in the Wii section of the forum, so it's confusing ! Why you didn't tell you were using a WiiU ?
always give proper information, you could get very bad help if mixing wii and wiiu file, it could even leading to a console brick !
vIOS247[56] (rev 21010, Info: d2x-v10beta53-alt-vWii): Trucha Bug, NAND Access
vIOS248[56] (rev 21010, Info: d2x-v10beta53-alt-vWii): Trucha Bug, NAND Access
vIOS249[57] (rev 21010, Info: d2x-v10beta52-vWii): Trucha Bug, NAND Access
vIOS250[57] (rev 21010, Info: d2x-v10beta52-vWii): Trucha Bug, NAND Access
vIOS251[57] (rev 21010, Info: d2x-v10beta52-vWii): Trucha Bug, NAND Access
247 and 248 are identical. no reason to have twice the same thing.
249 250 251 are identical. no reasons to have trice the same thing.
247/248 are not good and not working with lot of hdds. Don't use these slots in your loader's settings.
249/250/251 are good, use the one you want (249 is the default slot for usb loaders anyway, so set all the settings to default in your loader)
Now your problem : USB device not found. You need Y-cable on WiiU !
it's explain in any (respectable) tutorial.