This is an assurance that another’s obligation will be fulfilled, or something presented as such security; guaranty. In this case, they mean with taxpayer money.

And the guarantee is that the Germany economy is guaranteed to fall flat on its face if the German government continues its odd obsession with remaining dependent on China as a business partner. It’s recent dependency on Russan gas was just that much fun, I guess.
German guarantees for China investments plummet -document.
The volume of investment guarantees provided by the German government to companies investing in China has collapsed this year, a government document showed, highlighting the impact of Berlin’s efforts to end over-reliance on the country.
Only 51.9 million euros ($56.26 million) in guarantees have been issued so far this year, according to the document seen by Reuters, less than a tenth of the 745.9 million euros in guarantees issued over the whole of last year.