"Support me on this I'll support you on that" is typical and routine in the halls of legislators, although much quieter. If we look at this as DeSantis telling Disney "support me on this legislation and I'll support more of your self-governing district" it doesn't sound nearly as bad. It kinda happens all the time, everywhere laws and sausages are made.
That isn't what DeSantis said at all. Disney had already spoken, DeSantis said "because you said that, kiss your special district goodbye". This was no backroom deal.