The post give clues as if they knew something. Knew what exactly? That Jet2 are keeping a sole A330,w which as I keep repeating and did several times during long haul speculation, not a couple and they did this 2019-2020. Operating long haul is a different ball game all together. What happens when it goes wrong? Jet2 cannot just launch an aircraft or 2 to rescue 300 odd passengers like it can with operating to Tenerife or Lanzarote.
As I've already stated, Jet2 keeping a A330 means nothing in terms of long haul. They did so in 2019 and they used it to do the New York runs with assistance of the 757 fleet also. This was due to the retirements within the 757 fleet at that time.
Running a handful of flights to New York is different to what this poster/twitter account is alluding to which is long haul. And specifically only in the winter months.
I speculate that Egypt and Morocco will be coming. Within the next 2/3 years and actually with that "exciting news to come" I wouldn't be surprised to see that announced. Am I wrong sometimes? Yes. But do I allude to something based on the airline keeping a sole A330 when I know that they'll just operate to the canaries with it? No. Not like this account.