I think this is very good advice.  Tangible assets that maintain value, such as land, are the best way to guarantee (as much as one can guarantee) that you will hold on to your wealth.  No matter what happens, people are always going to want land.  The value and usefulness of bitcoin is contingent upon the availability of electric power and the internet.  If your area is hit by a hurricane, for example, you may not have access to either of these things, rendering your bitcoin worthless, at least for a while.