What exactly are "Testing Methodologies"? Experiencing conflicting information

Good morning fellow testers and developers alike,

I have been doing some extensive research online to find out what the term "Testing Methodologies" really means and I have come across conflicting information.

Some articles use the term "testing methodologies" referring to Models of the Software Development Life Cycle such as: Agile, Waterfall etc:

https://www.guru99.com/testing-methodology.html

https://www.veracode.com/security/software-testing-methodologies-techniques

In contrast, other websites refer to the term "testing methodologies" as being testing types. For instance: Unit testing, Regression Testing, Stress Testing:

https://smartbear.com/learn/automated-testing/software-testing-methodologies/

https://www.testingexcellence.com/what-software-testing-methodology/

As can be seen, there is reason behind my source of confusion, which leads to the ultimate question:

Strictly speaking, what exactly are testing methodologies? Models of the SDLC or Testing types such as Unit Testing and Beta Testing?