By the clause, yes you are not allow to offset your existing AL to deduct the x amount of days for notice period. But do check if you can turn it into cash else you rugi besar. Cannot deduct cannot turn to cash.
Once you signed an agreement, you are bind to a "contract" and they reserve the right to ask for compensation. Why would you want to sign such deal? I have reached out by a recruiter and I never sign any pre-agreement with the recruitment company for the job also. That should be between the recruiter company and the hiring company.