Makes perfect sense that his competition would say this. Who is Evan McMullin? lol...
We all know that the Johnson/Weld is not 100% Libertarian, but they have a many Libertarian principles, socially acceptable and fiscally responsible. You could NEVER expect a full, 100% Libertarian to have a chance until further down the road IMO. It's like turning a aircraft carrier, you can't just expect a decent percentage of voters to jump ship from the two party system to accept another party or turn the ship over night.
Given that, what Johnson/Weld offers is another option, proven with experience.
Unfortunately the general public with their "My team" and tribal attitudes are often blinded to other opportunities. This coupled with the a slanted media, corrupt republican and democrat special interests beholden to insiders and very little coverage of the "other" choice, really makes it almost impossible.
But at least they're trying to make a difference.