BuckmasterStumpGrinding
ArboristSite Operative
It looks safe to me. If you are scared you can put your climb line in the tree next to it. It would not be much of a swing if it gave way. That tree is standing after winds that applied hundreds of times your body weight to it. Or use a ratchet strap. With 4 or 5 wraps it has enough strength to hold a semi or two.