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It is a philosophical statement IF you mean that the current description of the photon given by QFT is fully sufficient such that no future possible deeper underlying mathematical theory - of which QFT might one day turn out to be an approximation - will ever meaningfully modify the core mathematical properties of the description of a photon.It's not a philosophical statement to say that QFT provides the only correct description of what a "photon" is. It's a scientific statement based on observational facts.

On the other hand, it isn't a purely philosophical statement but a scientific one IF you merely state the above statement as a working hypothesis. If you take this route then all unfalsified mathematical theories/models which offer a different picture AND which go beyond QFT - specifically way beyond known experimental accuracies - are still on the table as alternatives; this is true regardless of more advanced perturbative, non-perturbative or renormalization group theory arguments.