Earlier quoted context omitted.
Seed, to plant Not cede, to surrender
Giving control of policy to fringe groups is ceding control to them. Seeding an idea, to plant an idea does not jive here.
It does. If you want to see any reasonable policy passed instead of craziness, you need to convince some conspiracy groups to believe it, then it will be taken up by the administration and passed.
Plant the idea, they grow it and it gets passes. It's pretty clear that's what OP meant. 'Ceed', in this context makes no sense. In the discussed example policy is already coming from fringe groups, there is nothing to ceed to them. But to plant ideas with them that you want passed is how you'll get policy.
Note, not saying I agree or disagree with the original statement, just clarify what they meant by it.