That's great. Write a check."
But him writing a check isn't the point. If Warren writes a check, we get that check's worth of new government income. If taxes are raised, for Warren's contribution of the same check, we get much larger pool of spending. Put more simply: plan (a) warren donates $10 and we get $10 of government income; plan (b) warren is taxed +$10 and we get $10K of new government income.
The rest of the blog is well characterized as Dunning Kruger in action.