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TT CT2 SPDs and TN requirement

wallywombat
534.4.6 says that for TT systems where an SPD is upstream of the RCD, then a CT2 SPD must be used (fair enough), but also says that "the conditions of Regulation 411.4.1 shall be met". But 411.4.1 is about TN systems having a dependable connection to earth. In particular:
411.4 TN system

411.4.1 In a TN system, the integrity of the earthing of the installation depends on the reliable and effective

connection of the PEN or PE conductors to Earth. Where the earthing is provided from a public or other supply

system, compliance with the necessary conditions external to the installation is the responsibility of the distributor.

I don't get why a section about SPDs in a TT system refers to a TN requirement.
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    So on a TT system, if you have a CT2 SPD upstream of the RCD - i.e. with varistors between lines and N, and a gas discharge SPD between N and PE - is there anything that could go wrong which would require in some way a "better than usual" TT supply?
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    So on a TT system, if you have a CT2 SPD upstream of the RCD - i.e. with varistors between lines and N, and a gas discharge SPD between N and PE - is there anything that could go wrong which would require in some way a "better than usual" TT supply?
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