Grav Youtube Plugin: does lazy load functioning properly?

The Grav Youtube Plugin has a lazy-load function. It should increase performance of website.

After enabling lazy-load function the pageSpeed Insights test still warns me about:
Remove unused JavaScript :
en_US/base.js(www.youtube.com)
www-embed-player.vflset/www-embed-player.js(www.youtube.com)

and

Remove unused CSS
www-player.css(www.youtube.com)

Is it normal behavior or lazy-load is not functioning properly in my case?
Placed it as shortcode in Custom HTML particle in Gantry 5 framework, Process shortcodes is turned on.
Could someone confirm?

Did you set the option in the Admin dashboard, or manually? Because the option in the config file is lazy_load with an underscore.

I've set it in Admin dashboard.
The config file now looks:

enabled: true
built_in_css: true
built_in_js: true
add_editor_button: false
player_parameters:
  autoplay: 0
  cc_load_policy: 0
  color: red
  controls: 1
  disablekb: 0
  enablejsapi: 0
  fs: 1
  hl: null
  iv_load_policy: 3
  loop: 0
  modestbranding: 1
  origin: null
  playsinline: 0
  rel: 0
  showinfo: 1
  vq: hd1080
privacy_enhanced_mode: true
lazy_load: true