I'd be very skeptical of this. I've not seen footage from TB2s operating (successfully) in Ukraine nearly a year now. Last footage of this kind I could find was posted in September 2022.
The TB2 factory in Ukraine had been planned before the  war, but presently is said to be planned to open in 2025.
Also, according to one Eurasian Times article (which is a rather low quality source though) Russia might have struck a [secret] deal with Turkey to not supply Ukraine with any new TB2s, as part of the Russia-Turkey gas deal. Publicly that deal only included some deferred payments, but one has to wonder what Russia got in return. (It may have been something else entirely, e.g. another source points that Russia-Turkey trade has doubled last year, suggesting some [Western] sanction bypassing done that way. Exports of machinery and electronic components from Turkey to Russia nearly trippled in the first half of this year too.)
FWTW, the Russian FSB claimed that traces of explosives were found on some of these empty ships headed for Russia to pick up grain (rather than being headed for Ukraine) although after visiting Ukraine. (Apparently the main Russian concern was that Ukrainians would blow up the Kerch Strait bridge that way. But they also alleged by-the-by that the ships thus may have transported explosives to Ukraine, previously.) But that's not much of a smoking gun for several [obvious] reasons, for the main purpose of this question, of arms being smuggled into Ukraine.
Somewhat related, it's been reported by fairly reputable Western journalists that Ukraine has received old stocks of Turkish cluster munitions [co-developed with the US], but Ukrainian and Turkish officials themselves had rejected these reports at the time. (Even Russian officials were publicly somewhat skeptical, with Kremlin spokesman Peskov saying "It is difficult to comment on the credibility of such reports, but we are monitoring them closely.") Meanwhile, the US itself has supplied such ammo to Ukraine, so it's very questionable they or the Turks would have bothered to sneak some through these ships that the Russians would regularly inspect, given that there are alternative land routes through which most Western weapons make their way to Ukraine, which Russia hasn't managed to interdict much.