I think you are using the phrase "shameless plug" incorrectly. "shameless plug" is normally used to advertise _your own_ merchandize. For example, a Youtuber talking about his/her other Youtube channel shamelessly.
However, in your comment I think you meant to say "a dig" instead of "shameless plug".
"This is not intended as a dig on Lenovo...", or "I'm not trying to pick on Lenovo..."
cheers