Yep I'm 90kg and didn't have any trouble learning on the 11'4" Naish Nalu, I did fall off a few times the first couple of days in the waves but within a few sessions it was no worries, within a couple of months I bought a Jimmy Lewis Mano.
Whilst my JL is my go to board now, I won't be selling my Naish any time soon because it is still a fun board in the waves, you can catch waves soooo easy and it is great for flatwater cruising.