Reddit rumor was legit, as this was posted before in pro Delta, but the link subsequently doesn't work:

"We're committed to a premium Member experience, including in our Clubs. Delta SkyMiles Reserve and Reserve Business American Express Card Members will receive 10 Club visits per Medallion Year starting Feb. 1, 2025. Members can earn unlimited Access after spending $75K on their eligible Card in a calendar year and will have unlimited Club Access for the remainder of the current Medallion Year and the following Medallion Year. Tracking begins Jan. 1, 2024, for the 2025 Medallion Year.

Effective January 1, 2024, eligible Card Members with Basic Economy (E) fare tickets (or similar "Light" or "basic" tickets issued by a Delta partner) will not have access to the Delta Sky Club. Beginning Jan. 1, 2024, the Delta SkyMiles Platinum and Platinum Business American Express Cards will no longer provide Club Access. There will be no changes to how SkyMiles Members earn and redeem miles, the changes only affect the way they qualify for Medallion Status."

Nothing yet announced about the "vanilla" AmEx Platinum. Get out your popcorn.

How many of you will cancel the Reserve? But, I suspect there will be retention offers in an attempt to hurt the 'sting'.