Correct. Except it is not enough

You may go left side in Colonia direction, do there tricks with tritium deliveries and steal another 17000t. But if you will go right side of the Disk - there is no stations there to refuel.
So when you travel to right-side of the Disk, there is no hauling options, you will have to dig. So need a plan to make it less painful.
P.S. Can't decommission

- all my fleet is there.
I'm sure they get pushed to the nearest station when decommissioned. free travel.
if you're taking your carrier into the black for 160,000 ly journey, with your mining method that's just a bit shy of 500 hours of just waiting for the jump timer and mining for tritium. nothing else. unless you are traveling outside of your carrier and have a very high jump range to keep up to honk systems along the way.
if that's your planned use of time and your carrier then pain doesn't really have meaning. the carrier is really pointless to take around. i should know since i did a two year stint deep in the far reaches of the galaxy with mine thinking i could make an adventure of it and brought my ships with me in case i wanted to switch things up or 'gasp' actually had a need to. but all this kind of decision does is kill any enthusiasm you have for the game because it's a total, pointless, waste of time. and once you realise that, it's too late to turn back without suffering thru an equally long return journey.
if fdev had any desire to make more profit from this game they would add a fee payable in their arx to return carriers to last inhabited systems. they would make a bunch of money and save players from abandoning the game. that's how punishingly boring tritium mining is.
every minute feels like a minute you are closer to death with nothing to show because you are a slave to this rng lottery they call mining and for tritium all the winners are rewards that give you less than the ticket cost.