Yeah well… So is hosting more than one node behind a single IP. When it’s not updated for years and Storj Labs has changed their attitude towards many of the things stated, it’s hard to know which parts to take seriously and we’re kind of left to judge for ourselves which parts we should follow. This update has been long promised but never happened.
Those stats don’t account for risk of correlated failure of nodes which may contain multiple pieces for the same segment. If nodes use the same IP, that will never happen. So running multiple nodes on an HDD will not be any different from a risk of failure perspective unless you somehow use multiple IP /24 ranges as well.
Of course the impact on performance is still valid.