As the author in the OP notes, there's no way to get this perfect, even aside from just making mistakes and missing documented information, a new programming language can be "infuenced" by anything in the mind of it's creator(s).
But, hey, the chart gives us something to talk about!
On the other hand, Alan Kay was definitely influenced by Lisp when creating Smalltalk. (http://worrydream.com/EarlyHistoryOfSmalltalk/). So...
As the author in the OP notes, there's no way to get this perfect, even aside from just making mistakes and missing documented information, a new programming language can be "infuenced" by anything in the mind of it's creator(s).
But, hey, the chart gives us something to talk about!