You weren't necessarily ignoring them but you were perfectly willing to argue in Corbyn's favour all the same in spite of the fact that polling indicated he wasn't good enough. You actually had a point here though - by getting him into a position in 2017 where he was actually able to argue his points effectively, he improved and managed to dent the Tories majority. Not a win, and so not exactly brilliant, but an improvement all the same.
The same principle should surely apply to the parties approach to the EU though. The referendum itself was massive but it was won by a narrow margin, fueled by disinformation, ignored the contentious Irish border issue which literally has the potential to threaten lives if it goes sour, and didn't give the Tories anything near the mandate to push for the hard Brexit they've been advocating for since 2016. Up until recently Labour were supportive of that approach out of the sentiment that they couldn't go against it because of polling. Even though Corbyn's initial approach was quite literally to advocate for what was best instead of following the numbers.
Now the party seems to be mildly supportive of staying in the customs union and will go for that approach but it's still fairly muddled in that they'll make vague feints to the idea of a People's Vote even though they don't seem keen on backing one. And whenever the parties position is criticised in regards to the EU polling numbers are often the first thing pulled out. As is regularly evidenced in this thread, where the Lib Dems are regularly ridiculed for their shit polling numbers (that being a reason not to vote for them) even though for the majority of Corbyn's reign he's had...shit polling numbers!
There's surely got to be some consistency in there somewhere. The party are happy to follow the polling when it suits them but will happily advocate for other positions they like when it doesn't. And if your argument for supporting Brexit is due to it being one of the biggest referendums in electoral history, then argue on that point. Don't then pretend it's about polling.