There's something strange with the math in general, and going from 29 years out to 30 specifically. I entered:

Income: 100k, rent 1250, other expenses 1250.

In year 29, the expenses on the owning side are $1,017k. Go to year 30, and they drop to $405k.

Also, I can't figure out where Net is calculated from. It seems like it should be Income + Home Equity - Expenses - Tax - Home Payments, but that doesn't add up.

This plus the fact that you assume non-home investments do no better than inflation makes this pretty questionable to me.