No, the fact that Take Two increases the marketing budget for 2023 is not a sign that they intend to release GTA VI then.
The interpretation was made by Venturebeat’s Jeff Grubb recently after glancing at a budget forecast, but a Take-Two representative is now pushing the hypothesis down. The entry for marketing applies only to third-party companies, and because Rockstar is an in-house studio, they are not included there, the person tells Games Games, among others.
A Take-Two representative told GamesIndustry.biz that the table in the 10-K reflects marketing commitments made to third-party companies. As Rockstar is an internal Take-Two studio, that undermines the notion that the reported marketing commitments would be related to the next Grand Theft Auto.
So when Grand Theft Auto VI released is still completely free of speculation.