This also does not support your claim.

from your article.

The proof that it is possible is discussed in the article you posted. Because there is no Statement whatsoever that states otherwise. Your own information states that 2 x land entries are permittable and all 30 day exemptions can be extended by 30 days. There is no information anywhere that supports your claim because it is incorrect. BUT repeatedly crossing borders is never a good idea and you will eventually get pulled up by the imm police. Visa is best option for long stays...and rightly so if you are no longer a tourist.

So unless proven otherwise 2 exemptions can both be extended. Too many people make comments with zero proof and confuse people.

There is no rules that I am aware of, or have found, that say you cannot extend a 2nd 30 day exempt by land. There are no sources. That is my point. I am not sure on anything unless I see a source that proves you CAN'T. Which you did not provide and I can't provide either.

Read that already while researching. It does not support what you said.

source.

Don't know where you heard that Lopez. They are just normal 30 days. No reason they can't be extended for another 30, as Steve says.