The volume in the legs involved in this combo will stand out like a sore thumb when you look at the option chain. Even if the spreads were put on piecemeal on different days, the magnitude of the position would stand out in the Open Interest.
If trades of 260k, 260k and 520k contracts showed up at the same time on Time and Sales then it would have to be the same entity. If say 10k/10k and 20k trades appeared throughout the day or over the course over several days, the media could not be sure that it was the same entity, though the broker, the option exchange(s), SEC and the OCC would be privy to it.
FWIW, that's a trader with a set of cohones. There is not only open ended loss to the upside above 35 but a spike to that level will inflate implied volatility dramatically and with 2:1 short calls, that will wreak havoc on the margin required. Deep pockets!