What is being said is that once ADN reaches 90%, they WILL aquire 100% of all MEP listed shares - with or without the remaining holders acceptance.
MEP holders that do not accept the offer prior to 90% target then may have the wait until ADN or its authorised entity finalises the paperwork... Which could be several weeks.
As an example, as a shareholder, I was involved in the friendly takeover of echo resources. I accepted the offer and my friend did not. I received my payment prior to the closing date of the offer. My friend waited 3 months for his cheque in the mail.