Horseshit. Congress has nothing to do with any of these issues. All Congress has a say in the the time and place. That’s it.
The method of ratification is decided by Congress: “when ratified by the Legislatures of three fourths of the several States, or by Conventions in three fourths thereof, as the one or the other Mode of Ratification may be proposed by the Congress”
Consider if Congress decides ratification will be by State Convention.