"key voters".

"They voted in only one of the past two presidential elections;"

So 2016 or 2020 but not both...

"between ages 18 and 25"

You would have to be 22 or older to have voted in 2020, this age demo could not have voted in 2016.

"registered to vote since 2022"

Eliminates 18 and 19 year olds who would have registered in 2024 or 2023.

"did not definitely plan to vote for either Biden or Trump this year"

"or switched their support between 2016 and 2020."

Some strange use of the words "key voters" I'm not familiar with.