Just don't over think it, and don't follow anything that is strict and exclusionary.
Give some pureed food, its the best way to get them to actually experience a wide range of flavours, which is essential for avoiding fussiness.
Give some finger foods.. great for their learning, control, development, understanding etc.
Mix and match, go with your gut, introduce new things, don't give up on things they don't like etc.
But don't go to any extreme. I've seen children who had very little solid food, who ended up with an awful time when trying to move away from mashed dishes to more solid food...
And equally I've seen plenty of very fussy "BLW" children, who basically lead themselves into only eating what they liked.. and then bad habits and fussy-ness got re-enforced because their diet was restricted to only what they chose and gave a good reaction to.
So just do both, as parents have done traditionally for countless years. No fad or fancy thing required.