Re: £490 will get you a WD 16TB raid 0 drive from Amazon. (2x8TB Reds)
"In RAID-5 you can tolerate one disk fault"
Well, that's begging the question; the claim of the linked article is that for a certain, currently realistic, size of RAID5 array the likelihood of an unrecoverable read error during rebuild is as good as certain making the redundancy useless and meaning that a RAID0 array of equal capacity is more reliable as it has fewer drives.
It's not dubious, it's a perfectly logical argument, although I can't vouch for the actual figures used in the calculation.
It's not a great argument for the use of RAID0 and doesn't seem to be intended to be but it is a strong warning against the use of RAID5 in large arrays.
I thought it was interesting.