In my understanding. You can demonstrate significant technical contribution by providing some of the following:
An Open Source Library with a high number of users (GitHub Link, etc) and a definition of its value proposition to the industry
A letter from an executive of an innovative digital company where you have made significant technical contributions that have resulted in the success of the company
An overview of your own technology company that has had some success. You can demonstrate this through revenue, investment, number of users, value proposition, etc.
A letter from a company/companies where you have acted as an adviser/board member where your contributions have led to the success of those companies
Any scientific research that has contributed to the industry (e.g. paper/experiment in Data Science, AI, ML, Blockchain, Bioinformatics, etc.)