To be fair that's a 70GB reduction... on a game that initially had an install size of ~124GB. That almost certainly included uncompressed textures, audio with multiple localisations etc. If I had to guess likely encrypted packaging with compression applied afterwards (if at all). Plenty of room for quick wins that bring significant reductions in a title like that.This "game" doesn't need too much space but...
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It is always possible to "optimize" more.
Wildlife by comparison is a ~13GB install. As you say it doesn't use much space and it's unlikely there are going to be many changes that could be made to significantly reduce that install size.