If for some reason you need to rely on regular adverse possession instead of tax sale short statute of limitations, it requires ten years of possession after color of title.

Quote from @Aaron Antis: The others are correct.

You must use the HELOC in the appropriate manner to get the maximum benefits out of it, but what an awesome tool it can be when used correctly.

It seems like I should call them to confirm they are doing it correctly.

But it is not 90/10 - the notion is correct, but it's mathematically incorrect, because there are literally over a couple thousand agents in Milwaukee that do less than 5 transactions a year.

I’m thinking about doing this because I believe the following is possible (someone correct me if I’m wrong)1.

@Mike Dymski correct.

That doesn't relieve you of the need for all of the correct documentation notifications and information your accountant will need to fil the form 8824 at the end of the year. 

For bathrooms, you can use a higher temperature color like 5000 K.

And less often talked about but definitely happening is people buying because they (probably correctly) assume it's only going to get more expensive to buy in the future.