There used to be a JSON output file but no longer.
Fluffy is the player who runs the eq list, and as I've understood it, they have a special access to the equipment database to create... slothmudeq.tk, and the output file is no longer provided. For clarification contact Fluffy.
Its posible to make some template with plain view. Though i have no ideas, how you want all data to be organized in txt format. Even in original xml its quite complicated. But if you want list with names and stats only, its posible to do probably.
Check boxes beside all items that appear in the eq list... with a button to export selected items to a CSV format. There may also need to be a second button to "select all."
The reason for suggesting this method is recently I made a bard and was searching charisma eq. I wanted to export selected items to a text file as a list to myself to start popping them. I had to manually highlight each line copy and format it.
Pretty sure this would cover Constin as well if he could do a "select all" to CSV.