The writer got mad when a goblin shoved Astarion off a cliff. It reminded me of when I had Karlach shove a goblin in lava, then a goblin ran up and shoved HER in the lava. I didn’t get mad; I took it as a learning moment: enemies can shove me back, so move away from the lava.
This is so easily disproven that I’m wondering whether this is a troll comment. There are many well known RPGs that were developed independently and contemporary to D&D, which themselves have many derivatives. GDW published Traveller in 1977. Chaosium published Runequest in 1978 and Call of Cthulhu in 1981. Steve Jackson and Ian Livingstone have been writing Fighting Fantasy books since 1982.
D&D itself is based partially on Dave Arneson’s Blackmoor game, which he’d been designing since 1971.