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Fret not, people. Like I had mentioned, 45 is still available
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After selecting "All Plans" in the Airtel Thanks app, just scroll to the right most tab, called "Other Packs".
45 and 18 are listed (hidden?) under this tab.
As for the "Airtel Selfcare" website and the "Airtel Prepaid Recharge" website, they have effectively removed 45 from visibility. If one wants to recharge it through these 2 channels, we'll have to manually type in the number 45 in the box for recharge amount. 45 shows up in the "Other Packs" tab when we do so.