I think admitting it was an attempt at a false flag operation is the last thing such an operative would do if captured...
And Diosdado Cabello is not the most trustworthy figure.
Here is part of the original live announcement: https://videos.telesurtv.net/es/content/360738
I could only find a long version on Youtube https://www.youtube.com/watch?v=YVfXTDKrrHs with a kind of bad English dub.