” You are also incorrect in stating that RAID10 can sustain TWO disk failures”
When we talk about raid we talk about the minimum requirements. For example 2 disks for raid1, three disks for raid5 and 4 disks for raid 0+1 and raid10
My statement is entirely accurate if you consider a 4 disk system as I described and as you list above in your raid 10 example.
” Your definition of RAID10 is incorrect, the order of the digits is the clue, so RAID10 is RAID-1 RAIDsets that are then Striped (RAID-0),”
You are absolutely right. That’s what I get for making comments in a hurry 
The best way to think about both raid10 and raid0+1 is you take the last digit, in the case of raid 10 that is stripping and apply it to the first digit mirroring which makes it a stripe of a set of mirrors. Conversely you have with raid 0+1 you have a mirror of striped disks.
And thank you for the opportunity to play the babbling tech