YES

This TRS is terminating using the deltarestricted interpretation 
false(delta6) =  + 2 + 2*delta6
activate(delta5, X5) =  + 1*X5 + 0 + 0*X5*delta5 + 3*delta5
f(delta4, X4) =  + 0*X4 + 0 + 1*X4*delta4 + 2*delta4
true(delta3) =  + 0 + 0*delta3
n__f(delta2, X3) =  + 0*X3 + 0 + 1*X3*delta2 + 0*delta2
c(delta1) =  + 0 + 0*delta1
if(delta0, X2, X1, X0) =  + 1*X0 + 1*X1 + 0*X2 + 0 + 0*X0*delta0 + 0*X1*delta0 + 1*X2*delta0 + 1*delta0
activate_tau_1(delta5) =  + 1(delta5/(1 + 0 * delta5))
f_tau_1(delta4) =  + 1(delta4/(0 + 1 * delta4))
n__f_tau_1(delta2) =  + 1(delta2/(0 + 1 * delta2))
if_tau_1(delta0) =  + 1(delta0/(0 + 1 * delta0))
if_tau_2(delta0) =  + 1(delta0/(1 + 0 * delta0))
if_tau_3(delta0) =  + 1(delta0/(1 + 0 * delta0))

Time: 0.644113 seconds
SUCCESS

Statistics:
Number of monomials: 295
Last formula building started for bound 3
Last SAT solving started for bound 3