I'm not the parent poster, but I'm pretty sure they're saying that because Python is more popular in general (the base rate) it's more popular in AI/ML/whatever

I'm not the parent poster, but I'm pretty sure they're saying that because Python is more popular in general (the base rate) it's more popular in AI/ML/whatever circles because of better general support (more tutorials, more libraries, more people already know it before trying to use it for a specific problem).