The problem I see with a fixed deal right now is that while the price is projected to increase in October/January, that is based entirely on the assumption that Russia will continue their campaign in the Ukraine throughout that time. If they were to suddenly call it quits in September and reinstate the gas pipeline Nord Stream, wholesale gas prices would potentially plummet and you'd be stuck paying significantly more until your plan is over or you'd get stung with extreme exit fees. Either way the energy company wins and you lose.
If you just want the peace of mind from having a fix tarrif and don't care about the cost, more power to you. I think for those on lower incomes standard variable while it may have higher peaks it is almost more likely to see decreases in cost sooner.
The question really though is do you see Russia pulling out this year or do you think they will escalate as the west is weakened from the energy crisis/recession or civil unrest?