Yeah, I wouldn't worry about it. He's still very young - maybe he's just not that interested in solids yet.
Also, if she's stressing about it, he's probably picking up on it and that can affect their willingness to try things. I'd suggest BLS too - just relax, put some pieces of soft steamed veg or soft fruit on his tray and let him go for it. He'll get the hang of it with time.