It's misleading because it says "The H-1B program grew...", which to many implies that it was doing more immigration. It wasn't. There was less naturalization.

The chart says "H-1B Population Estimate". The chart is not at all misleading.

The first line of the tweet might be misleading. Although I also disagree that it is, because it's accompanied by a well-labeled chart, so you don't have to infer a meaning; it's spelled out right there!

Only if there is another line of "new green card holder previously holding H1B visa" which is expected to show exactly the opposite trend.

You still don't understand the problem here.

No it isn’t. It’s more like a rolling cumulative chart of all the prior years’ H1Bs combined.

...less the people who no longer have an H1B visa.

Just like a population chart is a rolling cumulative chart of prior years' births, less deaths.