gdal_translate GTiff drivers does not support NUM_THREADS creation option

I am using gdal to stitch together google earth engine tiles (35 tiles, roughly 100 gigs altogether).

First I build a VRT

import os
from osgeo import gdal

# Build a VRT
os.system('gdalbuildvrt /scratch/user/output.vrt /scratch/user/MODIS_NDVI_TIFF/*.tif')

Then I use gdal_translate to stitch them together with various creation options to help with processing speed:

os.system('gdal_translate --config GDAL_CACHEMAX 1024 -a_nodata 0 -of GTIFF -co COMPRESS=DEFLATE -co ZLEVEL=1 -co TILED=YES -co BIGTIFF=YES -co NUM_THREADS=ALL_CPUS -co BLOCKXSIZE=512 -co BLOCKYSIZE=512 -co INTERLEAVE=BAND /scratch/user/output.vrt /scratch/user/MyBigNastyRasty2.tif')

Specifically, I would like the resulting image to be a GeoTiff. However, I am getting this warning:

Warning 6: Driver GTiff does not support NUM_THREADS creation option

This is curious because the gdal website says that this format can use this creation option.

I am using gdal version 2.3.3. Why am I getting this warning?