The article is addressed to other people. It isn't an internal reflection of the authors own psychological process and joy/relief. That might be therapeutic, but instead it is addressed outwards as a dictat for how others should behave. Perhaps that is therapeutic too - catharsis often is, but that doesn't make it a wise course of action in a heavily divided country.

People can read words in different way - thus what you may see as a healthy response can equally be interpreted as a passive-aggressive call for continuing silence from the vanquished foes. Both things can be true. That isn't gaslighting - that's just the peril of the written word and the limits of non-verbal discourse.