Basically, as I understand things, it more or less is true. The reason is that not many apps are programmed in BASIC, and it's not very powerful, so while there is BASIC on Macs, virtually no one uses it.
On the PC end of thing, most BASIC stuff is programmed in Microsoft VB... And Microsoft doesn't make VB for Mac. There is a very similar Mac programming utility called RealBASIC, but it's not 100% interoperable with VB.