What are the civilian applications?
I am far from a domain expert, I only know of four current and speculated uses for antimatter: energy storage, inducing nuclear reactions, medical imaging, and one specific tumour removal method.
For the first one, antimatter has about 1000x the energy density of fission, but also unlike a fission bomb all of it reacts (with an equal mass of normal matter), which means 1 gram of the stuff is a bigger boom than Fat Man and Little Boy combined.
Fortunately, "15000 antihydrogen atoms" is a factor of 4e19 away from 1 gram, and even if it wasn't we'd probably have to fuse the antihydrogen into antilithium to hold that much in a not completely absurd storage system.
Inducing nuclear reactions might make for some interesting propulsion systems, or might make atomic weapon proliferation even harder to prevent; that's expected at around 10^18 (the microgram level), which is still 1e14 more than announced by CERN — if it works, this use is hypothetical because current production is so much less than that: https://en.wikipedia.org/wiki/Antimatter-catalyzed_nuclear_p...
Medical imaging is already done with positron sources (doesn't need complete antihydrogen atoms), and antiproton beam therapy doesn't need the antiprotons to be turned into antihydrogen at any point: https://home.cern/science/experiments/ace etc.
This substance can basically only do two things.
1) whatever ordinary hydrogen can
2) explode violently on contact with matter
Sure it's interesting to test 1) from a physics research point of view, but 2) is the only practical application that I know of.
If the same energy explodes as antimatter, to the extent that it is not radiation shielded what you get is a pulse of high-energy ionising radiation*; while to the extent that it is radiation shielded, it looks like order-of as many kg of TNT as the number of kWh stored, give or take.
* with a note that 10 joules of absorbed energy per kg of body mass is "if you're lucky you will fall into a coma and die in about a week, if you're unlucky you'll be conscious", and that 1 litre of ICE fuel ~= 10 kWh = 36 megajoules.