That is correct! There was a thread a while ago where people were arguing about some damaged spacers for sale with a damaged centre. There was nothing wrong with them but people were saying they were a deathtrap. I thought they were fine for the reasons stated above!
yup, i posted in that thread too and said the same thing.
if your only putting 5-6mm spacers on then you cant even get hubcentric as the hub is still taller than the spacer by a good 5-6 mm, and hub on a spacer that thin is gonna increse your bore size. that quote you posted is for spacers more than 15mm where the centre hub is covered, if you want more than a 15mm gap then yes i agree go for hubcentric but they are bullsh!tting about the centre hub taking weight, it is there for alignment only, its not a strong design that could even take the weight of a car, just cos you read it on a performance site please dont take it as truth, a lot of performance shops are just that, shops, selling parts with no mechanical knowledge.
please listen to my post as i know im correct, if you only want to space 5-6 mm then just buy the flat spacers, even the cheap plastic ones from halfords will be fine as they take no weight and only strength they need is to not be crushed.