it is just a new way of advertising bitcoin cash and playing with newbies heads making them think of they burn 12% of the total fee they gain the supply will decrease and price will go up! imagine empty blocks with 10-20 transactions that are paying 1 satoshi/bye fee and they are burning 12% of those
what they are burning is nothing compared to the supply of BCH and the fact that there is no demand for it.
this actually proves that bitmain has huge amounts of BCH stored thanks to the difficulty manipulations they did for a month or so.
see what a dumb joke this is:
https://explorer.bitcoin.com/bch/tx/89afa4b51cdc68915aad4499705cdde4f3f9a4a7e905f9a20d6ead565edb999d0.00078101 BCH burnt
https://explorer.bitcoin.com/bch/tx/7d8c853f262d8e5d88bd2d8e0e41cd27ee4683133fc971b582377b34f4bf3b3b+0.00012936 BCH burnt
besides who is to say they are not going to fork BCH tomorrow and make the funds in that address spendable? they certainly control the mining of it and the development of it.