Well we have no information that they intend to do that, so on information so far available its just a straight up nerf.
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Circon actually raised a valid point in his rant video, tier 5 and 6 arty is basically OP as all hell and this 'rebalance' completely ignores those tiers. In pen, DPM and damage terms they are proportionally way higher to their tier than the higher tier arty is.
The M44 is able to do 550 damage, it can one shot almost all tier 5 TDs, lights and mediums, in some cases with lowe roles, but the T92 is not able to