I wonder if that was a case of being literal as in, technically speaking gpt-5 isn’t being _trained_, while omitting that they are working on collecting and preparing the data.
They have recently confirmed that they were working on GPT5, without confirming or denying that they were training it.
I guess it isn't unthinkable that GPT5 is more than a year out given the gap between GPT3 and GPT4 was 3 years. At the same time, the rumourmongers at businessinsider said their sources are expecting a Summer release, which seems plausible. Nobody really knows when it will release besides Sam Altman though.