This is the first time I have heard this theory. From what you post I find it very interesting.
I wonder if other planets may do the same?
I also wonder if this change in size is reflected in a change of mass. I'm sure the information is in what you have posted but I am yet to look
deeply. If there is a change in mass then there could be a change in the Earth's orbit, if this is the case then this could have many implications on
various ancient buildings/sites which are supposedly related to the position of stars.
It seems that mass would not increase but instead density decreases.