Clear Prop
If as you say the theory behind leaving a suspect Thales probe on speaks of divergent design, bravo. DD is not additional redundancy, it's a form of fault isolation due to engineering approach. Keep in mind that the new Thales has a failure on record already. To my knowledge, the Goodrich replacements are unblemished, thus far.
I'd like to believe the remaining Thales is related to 'improved' safety considerations, unfortunately, it is a face saving crumb thrown to France.
I would not rule out that the Thales is vulnerable due to drain block. The inspect/clean/reinstall may be the fly in the ointment. If the drain is blocked even a little, water plugs the tube. If ICE was the issue, the Goodrich would likely have logged some failures, (they may have).