OTT-MIN wouldn't do good on ABC, either! Just like this year FLA-VGK wouldn't have done good on ABC. It's not just matchup dependent for TNT. It applies to ABC, also.
FWIW, Top-4 (because ABC had 4 playoff games) non-SCF viewership games for Broadcast & Cable in 2023 playoffs:
-Cable-
TNT (BOS-FLA 1R G7) 3.095M
ESPN (SEA-DAL 2R G7) 2.746M
ESPN (NYR-NJD 1R G7) 2.045M
ESPN (SEA-DAL 2R G6) 2.042M
-Broadcast-
ABC (DAL-VGK WCF G5) 1.957M
ABC (NYR-NJD 1R G6) 1.932M
ABC (NYR-NJD 1R G3) 1.614M
ABC (DAL-VGK WCF G2) 1.616M
Zero games on ABC broke 2.0M these playoffs.
Ten (five excluding SCF) on cable (7 TNT, 3 ESPN) broke 2.0M on cable.
Matchups matter for ABC, too. Not some mythical creature where 5.0M would have been watching VGK-FLA on ABC this year. The number would have been bad on ABC, just like it was on TNT. It would have been a bigger number, but just as bad because it'd be measured against OTA. In addition it wouldn't come with the 'cable' explanation people are overusing. In reality, it was the matchup that was the problem, much more so than "cable."