YES

This TRS is terminating using the deltarestricted interpretation 
true(delta5) =  + 0 + 0*delta5
less_leaves(delta4, X5, X4) =  + 0*X4 + 0*X5 + 0 + 1*X4*delta4 + 1*X5*delta4 + 2*delta4
false(delta3) =  + 0 + 0*delta3
cons(delta2, X3, X2) =  + 1*X2 + 0*X3 + 3 + 0*X2*delta2 + 3*X3*delta2 + 3*delta2
leaf(delta1) =  + 0 + 0*delta1
concat(delta0, X1, X0) =  + 1*X0 + 1*X1 + 2 + 0*X0*delta0 + 2*X1*delta0 + 1*delta0
less_leaves_tau_1(delta4) =  + 1(delta4/(0 + 1 * delta4))
less_leaves_tau_2(delta4) =  + 1(delta4/(0 + 1 * delta4))
cons_tau_1(delta2) =  + 1(delta2/(0 + 3 * delta2))
cons_tau_2(delta2) =  + 1(delta2/(1 + 0 * delta2))
concat_tau_1(delta0) =  + 1(delta0/(1 + 2 * delta0))
concat_tau_2(delta0) =  + 1(delta0/(1 + 0 * delta0))

Time: 0.394272 seconds
SUCCESS

Statistics:
Number of monomials: 325
Last formula building started for bound 3
Last SAT solving started for bound 3