That is incorrect on a federal level, your milage may vary with city/country/state laws. Federally in the United States the right to reasonable expectation of privacy does not extend to outside of your house per Hester v. United States, 265 U.S. 57 (1924). The government is allowed to surveil you from public airspace without a warrant per Florida v. Riley, 488 U.S. 445 (1989).
That site is full of false claims with zero sources to back up those claims which is pretty funny seeing as that article is claiming to be written by a retired corporate attorney. The site is also chocked full of SEO tricks which is possible why it was the first result that came up for you. For example on 5. the word drone is stealthily a link to another irrelevant article about drone deliveries on a different as sketchy site. Link hiding is a well known trick to gain the system and bump up your page.