Please let’s stop jumping to conclusions. There is no evidence that EMALS’ length is being changed and in fact it is most unlikely.
Everyone quotes 90m (300ft) length but that is just a nice round number that isn’t accurate. EMALS is actually composed of 29x 12ft segments (according to congressional testimony in 2009), ie. 348ft or 106m long. That doesn’t include the braking length, just the power stroke (acceleration length).
So when journalists quote 90m or 100 m or 105m they are all talking approximate numbers, not actual lengths on an engineering drawing.