"there is a lot of talk about" is correct and usable in written English. You can use it to indicate that the topic of your sentence is a subject of discussion. For example: "There is a lot of talk about the upcoming presidential election in the media.".
In every age group there is a lot of talk about sex and also romantic complications.
As I pointed out recently, "In Israel there is a lot of talk about the 'day after.
"There is a lot of talk about an Islamic state.
"There is a lot of talk about physicality in tennis.
There is a lot of talk about localism.
"There is a lot of talk about the information economy," he said.
To be honest, there is a lot of talk about a lot of things.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.
Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com