SVG Sprite Tools - gulp command does not work -> gulp file is not set up correctly with current formatting?

So, I am getting the following gulp error when trying to run the gulp command with the project files, whilst in the correct folder path in terminal (svg-build-tool):

assert.js:374
 throw err;
 ^

AssertionError [ERR_ASSERTION]: Task function must be specified

upon doing a bit of research, I came upon the following post regarding this issue: https://fettblog.eu/gulp-4-parallel-and-series/

because gulp.task(name, deps, func) was replaced by gulp.task(name, gulp.{series|parallel}(deps, func))

So my question is, A.) If use of gulp was required as a pre-requisite to this specific video in this module, why was that not explicitly mentioned? And B.) if this is simply a file syntax error, resulting from the video being 3 years old, why haven't the video and subsequent files been updated?

I am not sure what to do with the information in the video now...