Nobody killed the sycamore tree - they coppiced it, and it’s regrowing with vigour.
For comparison, we had to fell a mature sycamore on our land last year; this now has more than a dozen shoots growing from its base, ranging between six and ten feet tall, all with lots of leaves on them.
You claimed the tree was “regrowing with vigour” - this is simply false at this point in time.