Burning such amount of tokens from the total supply is a very good move to help investors. But heifer this can reflect on the price, there has to be a demand for XLM. If the team is not making any good moves on developing the project further, then I don't seen this having any impact on the price.
NPXS for instance burns tokens every quarter yet price is tanking daily. Basically, burns should be facilitated with good developments to create demand.