Yes, but it was still just one series exactly as
@SI stated and you quoted. So it's not personal bias, it's factual. As deserving as Tavares is for that series win... he has gotten way more mileage as a playoff performer then he deserves. Especially, when it's held in comparison to Barzal's playoffs.
My theory is that some people on this site look at Barzal's flashy and Tavares' boring playing styles and mistakenly reinforce some stereotypical narratives... one is a highly skilled inconsistent choker and the other is a two-way playoff performer. When the reality is way more muddled, but accomplishments thus far factually support Barzal.
Tavares has decent Playoff numbers and carried a team to one career playoff win. He looked awful in elimination games against Tampa and Washington.
Under Trotz, Brazal has lead the Isles in playoff scoring in all three playoffs, including two conference finals and six post season series wins (I included FLA play in). But his poor second series against Pittsburgh and his pointless game seven against Tampa (who also had a pointless Kucherov, Stamkos, Point, Hedman and an additional 20M of cap or so) get as much negative mileage as Tavares undeserving positive credit.