The "has had a 1:1 conversation with" gets very broad. E.g. I've had a 1:1 conversation with a Norwegian MP who sat in parliament in periods that means he almost certainly had 1:1 conversations with current NATO general secretary Jens Stoltenberg, son of former Norwegian foreign minister Thorvald Stoltenberg, and who certainly had conversations with Gro Harlem Brundtland, former Norwegian PM and WHO general secretary for years.

Those paths connects me to almost every world leader from the 1980's onwards.

What you'll quickly find is that some people have 1:1 conversations with a lot of people, and relatively "unimportant" politicians in particular do so both with "regular people" and all the other parliamentary members including the "important" ones, and there are many nexuses like that where once you find a connection to one it's a massive shortcut for a surprising proportion of the world.