You were right, but the Supplementary Bidders Statement has...

You were right, but the Supplementary Bidders Statement has updated that figure.

3.1 f'tnote 19
"As at the date of this Bidder's Statement, HOCHTIEF Australia owns approximately 83.15% of the CIMIC Shares on issue. For illustrative purposes only, if HOCHTIEF Australia's shareholding in CIMIC remained at approximately 83.15% on the date of the Offer, then in order to satisfy the requirements in Part 6A.1 of the Corporations Act, HOCHTIEF Australia would need to, during the Offer Period, acquire a further approximately 12.64% of CIMIC Shares (increasing the percentage of CIMIC Shares in which it has a Relevant Interest to approximately 95.79%)."

It now looks to be a high bar, so they are emphasising the horrible fate that awaits those who fail to surrender, including the threat of delisting:
"without the need for CIMIC Shareholder approval if an application is made within a month after the end of the Offer Period and if:
(A) at the end of the Offer, HOCHTIEF Australia owns or controls at least 75% of the CIMIC Shares and the Offer remained open for at least two weeks after HOCHTIEF Australia attained ownership or control of at least 75% of the CIMIC Shares; and
(B) the number of CIMIC Shareholders having holdings with a value of at least $500 is fewer than 150.
In addition, if an application is made more than a month after the end of the Offer Period, ASX guidance indicates that ASX would likely approve an application for CIMIC to be removed from the official list of ASX with shareholder approval and, where such removal is sought later than 12 months after the end of the Offer Period, HOCHTIEF Australia would be entitled to vote on the resolution approving the removal."