It's only a royalty on licence income. If company sells, imec get nothing via that clause. The option to negotiate in August 2022 probably allows 4DS to pay something to imec, which I'm sure was discussed in the recent negotiations.
ie 4DS have could have said
> need your help to test the parameters so we can demonstrate how the tech works in different configs
>that data will inform our buyers what they are buying so will help us sell the lot or gain licence income
>we can pay you €600k for first half of 22
> sign up with us for full year because we will either have royalties to pay you or can settle the bill in August 2022 if we've sold the company.
imec aren't a charity so would have looked at the commercial risk they're taking, to have an ambiguous agreement for the second half of next year probably means imec knows they won't need it, or they will be guaranteed payment via some mechanism (sale, royalties, working capital)
might also mean 4DS can continue operating without the need for an immediate capital raise, because they plan to licence some of the IP before they have to pay imec fees, or have simply kicked the can down the road
