I doubt he has over a dozen match winning innings in all formats combined, nvm just T20i innings. But go ahead and give me a dozen innings,(T20I, ODI and Tests combined).
Let me help you clear your doubts since you don't watch cricket.
1. Stood firm in a D/L chase against SA at around 30* something - CT '17
2. Stood notout in the SF against Eng around 40* something - CT '17
3. Scored a vital 46 and played accumulator's role to its best in his first ever major final - CT '17
4. Scored 65 against ENG after coming from back from the thrashing WI gave us - WC '19
5. Scored 69 against SA in WC '19
6. Scored undefeated 102* against NZ on a very tricky pitch and a must win game - WC '19
7. Scored run a ball 47 against afghanistan in a must win game - WC '19
8. Scored run a ball 96 in a must win game against BD - WC '19
9. Scored undefeated 69* against india in our first WC win over them - T20 WC '21
10. Scored a matchwinning 50 against afghani spin on a turning track of Sharjah - T20 WC '21
11. Scored 195 against Australia to save a test match. (only naming it because Wisden added it into top 5 match-saving innings ever in the history of cricket)
12. Scored 54 in a WC SF - T20 WC' 22
13. Anchored Fakhar in the 402 run chase against NZ in WC '23
14. Scored ton vs Australia on 70 balls in our highest ever run chase in ODI history
15. Scored back to back tons against Australia to win an ODI series against Australia after 30 years.
16. His first test ton vs NZ 2018 - Match winning.
17. Match winning Ton against SL in Karachi 2019
18. Match winning ton in galle 2022 where he partnered with Naseem for the 10th wicket.
There are several innings that I must have forgotten here but Babar's legacy will live forever.