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For me, does supply really have much impact on token price? Token demand is crucial regardless of the supply number
Burn coin sometimes can affect on price, but cannot be settled or so on so this step will only have an impact in short term, the further development and market conditions will also be a determining price in which direction.
It's only good if wins publicity and attracts people to buying some of the remaining stellar. Otherwise it's a useless gesture.
Burning coins themselves can attract the attention of the public, especially crypto lovers see that developers consider it important to destroy some of their coins to keep supplies from getting too large in the network, which often causes the price to be difficult to rise.
XLM will start distributing its latest airdrops via keybase account and will run for 20 months, which means it will make the amount of their supply in the network back a lot, so the developer steps to burning some of it as a good step.