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True Strike never says certain concealment from certain sources get to avoid it so that means True Strike will matter unless otherwise stated.
You are right. True strike never states that.
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Additionally, you are not affected by the miss chance that applies to attackers trying to strike a concealed target
True Strike does state the above as per the spell. However, spells like blur and fog cloud give you the effect of being concealed without actually being concealed. It is an effect that is generated by the spell.
Think about it this way:
Bob and Joe are standing in a field. Joe has Gloves of True Strike. Bob casts Fog Cloud. Joe then attacks and rolls his miss chance.
Is Bob concealed? No. He is just granted the effect of concealment by a spell. He is not actually concealed. So the miss chance still applies.