I'll be very honest and say, no, I don't think that you can be a healthy overweight person.
I used to have that mindset to a degree. I've apparently got pretty good genes and have always been pretty healthy. No joint issues. No back issues. No high blood pressure. Nothing. Heck I never even had a cavity until I turned 40.
So I, too, used to think that being fat was not a problem for me. I could be comfortable with my body weight and never suffer for it.
But then I started looking at my family history and realized that it was rife with problems and illnesses and issues that cropped up when my parents and grandparents were in their 50s and 60s - and which ultimately killed all of them.
So it's great that I felt healthy at a heavier weight, but the long term damage I was doing to my body was NOT WORTH IT. You may have a healthy heart - but it still has to work twice as hard as it should to do the job it needs to do. And ultimately it will wear out faster. You may have healthy joints NOW, but after 40 years of carrying an extra 100 lbs, I guarantee you'll have issues. You may be fine now, but what happens when you're 45 and develop insulin dependent diabetes (as my g-mother did, and ultimately died from)? And what about all the cancers and heart issues that being overweight is a significant risk factor for?
I think if you say you're "healthily overweight" then you're really fooling yourself. I'm sorry if that sounds harsh, but I believe it's very true. Because it's not just about how healthy you are today, it's about how healthy you can stay long term.