What he means is probably the idea of Earth Expansion. See Ott Christoph Hilgenberg, a disciple of Alfred Wegener, and more recently (but still a couple decades ago) Australian geologist Samuel Warren Carey. Here's a 1982 video featuring him on the topic of “Planet Earth: A Question of Expansion”:

https://youtu.be/Othb0xsvZb4 – 26 minutes

This view is kinda ostracized in geology and considered heresy.