What is uvm_reg.has_reset(.delete(1))?

hello, i am curious about uvm_reg.has_reset(.delete(1))

i think has_reset(.delete(1)) removes initial value(reset value) of uvm_reg. but, i tried this, it was not.

coef_r is my uvm_reg.

how do i remove initial value of uvm_reg not using set_reset?