I'm hypothesizing here but I am assuming Murphy is looking at opposing pitcher splits and filling in bodies to correspond. I don't know what Soroka's splits are against R/L but I'm assuming it is wild enough that Murphy wanted 8 LH bats in the lineup. The names Jones, Hamilton, Frelick, etc mean less than the (L) or (S) next to their name.
Whether that is the correct move is debatable, I would also be playing Lockridge over Jones right now without thinking twice... but I'm assuming that is what is happening.