Walmart speakers in an LS460? 🤣
Audio systems can be very particular when it comes to impedance. Yes, it is possible to trash an amplifier if speakers with incompatible Ohm ratings are used. I used speakers with incompatible Ohm ratings on a home audio system many years ago but I had to wire in crude adapters and the results weren't ideal.
The following website is about the importance of impedance matching: https://www.techwalla.com/articles/2-ohm-vs-4-ohm-speakers