The only thing that's changed in the last 3 years is the recommended age to start, ie wait till 6 months.
There are many pro - baby led weaners on this site. This method is growing in popularity, but the currently accepted norm is still baby rice, purees etc, as described in your Gina book.
I'm not saying there's anything wrong with BLW, indeed it seems to have a lot of merit, but sometimes this site can make it feel like it is the norm and everyone is doing it. ( as is also the case with reusable nappies, co-sleeping, exclusive breastfeeding till 6 months, which IME are quite rare in the 'real' world).
BLW is not the norm, IME (not criticizing it, just stating a fact), so if you want to carry on with the methods in the Gina book,(purees etc) then by all means do, most people do. Just think about trying to hold off a bit longer - this is where the advice HAS changed.