Yes, you misinterpreted that information.
You can invest any amount of ethereum. Literally, I have seen an investment of .0001 eth, but hey, the more the merrier.
25,000 eth is the total amount from all investors for the project to continue development.
Which, that minimum is nearly reached as we speak.
Current crowdfund totals: 24,900 eth.

I'm guessing this project will bring in 40-50k eth. Hope this helps