I definitely prefer my DSLR & is definitely my choice for top quality. But I think these shots from my Nikon P610 superzoom bridge camera. Are quite respectable. All tools have their place.
By all means, "top quality" results will be available when using "top quality" gear. It is, of course, no guarantee of any such thing. Hating to be redundant, it is the photographer along with their talents and skills
and not the camera that makes the difference.
If "the result" is getting the shot, then there are distinct disadvantages to bags full of gear and long, long lenses which require tripods to achieve highest quality. Keep in mind, each of Tony's shots have been taken hand held.
No one is pretending expensive cameras and lenses do not have advantages over a bridge camera costing a few hundred dollars. Most of those photographers you'll find in my links also carry and use expensive gear when it is the only or "best" option.
The idea, however, that only a more expensive hammer will drive the nail more accurately is absurd IMO.
We're talking birds. The birds don't give a ratsass (speaking as much as I can for those hawks) what camera and lens you have.
I would suggest you too open a few of the links and read. If after you have read a few articles and blogs, you still see nothing of value, well, the old saying about horses and water comes to mind.