AppleScript to Add Multiple Files to VLC From List Results
This AppleScript code works for me using the latest version of macOS Mojave.

As a side note, I understand your list is generated from searching a FileMaker database. However, I do not have that application nor do I know what your code is to search the database file, so I "hard coded" the file list just for example purposes.

set theSongs to {"NoDoubt:Music:Rock Pop:ABC:The Beatles:Abbey Road:01_come_together_alac.m4a", ¬
    "NoDoubt:Music:Rock Pop:DEF:Fleetwood Mac:Rumours:01_second_hand_news_alac.m4a", ¬
    "NoDoubt:Music:Rock Pop:MNO:Van Morrison:hymns_to_the_silence_disc_1:1-02_i'm_not_feeling_it_anymore_alac.m4a", ¬
    "NoDoubt:Music:Rock Pop:PQR:Pink Floyd:Wish You Were Here:04_wish_you_were_here_alac.m4a"}

set theSongsAlias to {}

repeat with thisSong in theSongs
    set end of theSongsAlias to alias thisSong
end repeat

tell application "VLC" to open theSongsAlias