Email Marketing mount lists website theme

[RodMatt]

Email Marketing mount lists website theme​

I'm try to figure out what system PHP, Wordpress this website using to mount lists on screen... I'm not try to get that lists, the lists I do already have..., looks like a theme with a plugin because I know who own the website and he is not a tech guy.., so probably he have a Excel database and create a small MySQL DB count system based on Excel CSV data .., can some one help me to find what's it?

Following: https://www.listasdeempresa.com/criar

Regards