Quite possibly yes. I did lots of reading up and watched a ton of videos etc. but ultimately injured myself anyway. Nothing bad, just severe DOMs. I really tried to emphasise pushing with my heels but perhaps ended up pulling with my back too much anyway.
My point was that SLDLs hopefully have filled a weak point to some extent now.
Of course they do, and that's why some people do them as their primary back/hamstring-y thing.
The point with executing a deadlift is pushing via heels, sure, but in order to do that effectively, the core needs bracing properly - same for any other lift. If your lumbar isn't braced, no matter how hard you focus on your heels, your back will feel the strain.