Look at the date, it was from 2010. It was true then. As to whether if it is still true that they still sell it is not a real concern. Finding seller of any product in all accounts is time limited, it means they stop selling something eventually.
Hm, thanks for the link dude. I think I damaged my SC miniSD beyond repair lately, so I might be interested in getting a replacement.
I mostly used it for old DS homebrew, especially things that required a slot-2 card with GBA compatibility (like SnezziDS for instance).
EDIT: regarding mini-vs-micro, miniSD had a solid year or two of prominence before microSD was introduced, but once microSD came out, miniSD kinda fell into obsolescence. The SC miniSD just happened to be manufactured during that 1-2 year "sweet spot" which ended up being a bad thing.