That Flow will change the status of any lead who filled out the Trial Form in the past.
If you want to restrict it to particular set of leads, Elliott's right that you need to constrain the leads further with the Smart List earlier on.
You could alternatively create smart lists with Filled Out Form in past 30 Days for each type of Form if that is part of your goal.
Then your Flow would be:
Change Data Value:
Choice 1: IF Member of Smart List IN "Trial Form Fill Outs Past 30 Days" THEN Change Lead Status to "Requires Attention"
Default: do nothing