Details of "To trigger: create a text file"

Let's say I filled 8GB storage space with normal files like PDF, DOCX and presentation files.

• What does "To trigger: create a text file" mean? I simply create "any-name-here.txt" with a "password:" prefix?
• Also the "The remaining disk is remounted," doesn't make one thing clear - will the TXT file I crated, in this case "any-name-here.txt" will be deleted securely once the firmware detect it?
• What if I or attacker simply make a bunch of .txt files with "password:" prefix to try bruteforce? (if there are many password: prefixed TXT files, firmware should activate the timelock of 1 minute before trying another one)