Sure, you were right to point out that freshsqueeze was incorrect in saying they funnel donations to their overpaid CEO, but the fungibility point is an important one.
A related point on fungibility turned up in earlier discussions: donating directly to Firefox might not count for much if Mozilla balance it out by redirecting the same sum of their general fund away from Firefox. [0][1]
Overpaid relative to what? Other CEOs of similar sized non-profits? Do you have evidence to support that claim?