Question about Indiana Family Pack

My third and the best, already from the quality, incl. pump and paddle. We need the SUP for two
150Kg. and it still has room for improvement. 100Kg is probably the manufacturer's guarantee. Super part

I guess because it's a good starter package that meets all the needs of a family. If you want to pack your whole family on a SUP, then you are probably better off with a bigger board.
Because it is not precisely defined, many manufacturers, especially cheap ones, are not completely honest about the useful weight.