You aren’t being flooded with insulin with the GLP-1 meds. You have food in your body, but my insulin levels, on average, are possibly lower than yours (if I’m in need or a GLP-1 med) despite eating the same amount.

A GLP-1 med stimulates the release of insulin slowly over a sustained period of time, not just as a massive spike when I eat.

Everyone (that isn’t diabetic) has a massive insulin spike when they eat something that spikes their glucose. GLP-1 meds don’t make that better in any way.