I believe (and I'll let one of the sites Guru's correct me if I'm wrong), that this is referring to any subsequent rate changes that occur after the modification itself. So, if the new modified loan is an ARM loan, while the initial loan modification itself would not trigger an ARM disclosure, any subsequent adjustments resulting in a new payment amount (now based on the modified loan contract) would trigger the ARM notices.
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My opinion, take it for what its worth. Opinions expressed are my own and not those of my employer and are not legal advice.