The Court of Arbitration for Sport judgement saw team-mates Kilty, Zharnel Hughes and Nethaneel Mitchell-Blake also lose their medals through no fault of their own.
Ujah, who tested positive for the prohibited substances ostarine and S-23, said in a statement on Friday he had "unknowingly consumed a contaminated supplement" and apologised to his "team-mates, their families and support teams".
Kilty said Ujah had not contacted his team-mates on Friday but had spoken to them previously to explain his situation.
"We haven't heard from him today, we spoke to CJ on a Zoom call about two months ago," Kilty told BBC Radio Tees.
"He apologised, he thinks it was in his supplement, but the supplements weren't on Informed Sport (and therefore certified for safe use), they weren't batch tested.
"It has to have the Informed Sport stamp, they are the rules we have all followed, and for the last 21 years.
"It's devastating that another team member hasn't followed the rules as strictly and we've been burned by that.
"I feel sad, it's a devastating situation.
"CJ's obviously has always been a very hard-working, talented athlete, like we all are. And he's apologised. I'm glad that he's apologised to us, I'm glad that he's apologised to our families and the whole set-up.
"I'm thankful for the apology, but on the other hand the rules are the rules.
"You are responsible for everything that goes into your body, you are accountable for that.
"You never expect, it doesn't go through your mind once, and it never ever crossed my mind, that one of our members would fail a drugs test. You never think it, not in a million years.
"Only he knows the truth. You've got two situations, either he took drugs or it was contaminated in his supplement that wasn't tested. Either way it is not following the rules."
And Kilty lifted the lid on the personal devastation he must now face up to, revealing that he never had the chance to let his son take his Olympic silver medal into school.
"It's heartbreaking to finally hear the news that the medal is going to be stripped, it's going to be wiped from history," he said.
"When it initially came out (last August), I'd only arrived back in Teesside from Tokyo for two days and the news broke he'd failed the test.
"And since then it's been very, very confusing for me, my family and the British team.
"The happiness for me was winning an Olympic medal and giving it to my son.
"And my motivation all through 2021 was to win an Olympic medal and give it to my son, because he's in school now, and for him to take the medal into school and say, 'Look my dad's won an Olympic medal'.
"And I never got to do that, because by the time he'd started school the announcement had come.
"So the motivation is for the next two-and-a-half years to make sure that job gets done properly this time."
Kilty, 32, now wants to turn his attention to the next Olympics.
"I want to push to win a new medal in Paris 2024," he added.
"It gives me an excuse to think I'm going to press on, I'm going to get the lads together and hopefully we can win a gold medal next time. Hopefully we'll be Olympic champions."