That is true. This belongs to the component "Store, Tavern and Inn Fixes and Restorations". It restores the store/tavern from original BG1 that does not have resting but only drinking. As Echon already pointed out this reflects the actual situation in the tavern.
You can avoid this replacement by removing the following from the "setup-bg1ub.tp2" and re-installing the mod again (note the install order of your current install, though, and you have to play a new game, I am afraid, as the changed bartender will only show if you haven't entered the Elfsong Tavern yet):
////////////////////////////////////////////////////////////////////////////////////////
// Elf Song
COPY_EXISTING ~%EBaldursGate_ElfsongTavern_L1%.ARE~ ~override~ // Restore Elfsong bartender
PATCH_IF (SOURCE_SIZE > 0x11c) BEGIN
READ_LONG 0x54 actOff
FOR (READ_SHORT 0x58 numAct; numAct; numAct -= 0x1) BEGIN
READ_ASCII actOff + 0x80 actor
PATCH_IF !("%actor%" STRING_COMPARE_CASE "%tutu_var%BART11") BEGIN
WRITE_EVALUATED_ASCII actOff + 0x80 ~%tutu_var%BART8~ #8
END
actOff += 0x110
END
END
BUT_ONLY_IF_IT_CHANGES
COPY_EXISTING ~%tutu_var%TAV0705.STO~ ~override~ // Elf Song
SAY 0x0C #11674
BUT_ONLY_IF_IT_CHANGES
Alternatively, you can just cheat in the "_bart11" cre to have the former bartender.