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.
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.
Yes or you could extend the 60 day visa for 30 days and THEN go out and back in on the 30 day exempt...and then extend that for 30 days....5 month total stay.
Yes I agree. People get very confused.....I think it should be referred to as 1. Retirement visa (OA) or 2. Retirement extension (O). Easy terms for people. Anyways you guys are the experts and are great with helping people out. I guess I am just bitter that there are very few options for the under '50's who can't 'retire'.. ;)