That's a sophestry.
D+3He produces no neutrons, but how do you stop D+D, a more reactive chain, from producing netrons in the same plasma? In seeking neutron free fusion we must rule-out any fuel containing Deuterium.
3He+3He produces 4He + protons. Protons fuse to make Deuterium, which fuse to make neutrons. In that way, any fuel with 3He produces neutrons.
6Li is burned with protons or 3He, both of which produce neutrons as described above.
7Li fuses with protons, that fuse to produce neutrons.
11B also fuses with protons, producing neutrons when the protons fuse.
While the quoted reactions produce no neutrons themselves, each one happens in a fuel mixture that results in neutrons from side reactions, as shown. That was my point.
Pardon me. I confused its high cost with scarcity. Looking into it, I see that lithium supply will not be a problem.