yes the most recent EAD regarding "frozen AOA" indicators (resulting in spurious speed decrease to close to or below VLS causing the nose to pitch down in Normal Law) does seem likely to be the cause. Maybe the pilots weren't aware of the new procedure ?!
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You couldn't be more wrong - Two frozen vanes would cause Alpha Prot to erroneously increase up the speed scale. This would cause the stall protection system to kick in and force the aircraft to pitch nose down regardless of any side stick input. In effect the aircraft would be protecting itself from the stall before it needed to - A good thing in the Cb situation but not so good close to the ground.
However, if the pitot tubes became blocked (especially if climbing) then the opposite happens. The aircraft thinks it is going faster than it actually is and either the pilot or autopilot protects itself by pitching up unnecessarily and stalls for real - much worse.