So...vinyl and cassette sales both grew but the market for physical media overall is shrinking.The vinyl revival has always been niche in the context of overall music consumption. If the figures quoted are accurate, it hasn't hit a brick wall. Just the growth of uptake has slowed.
That's hardly a surprise. It's a very expensive way to reproduce what are now mainly digital files originally. And now that those files are available streamed in their original format - which is increasingly high resolution digital - the usp of vintyl decreases.
As a final negative, vinyl is environmentally unfriendly and the recent state of oil prices will have done nothing to improve pricing of vinyl releases.
Despite all that, sales are still growing.