Surely you mean the infamous lies about the Mann 1999 "hockey stick"? The Mann 1999 results are correct (see for instance https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5505119/figure/... for confirmation) and the graph doesn't do anything more nefarious than the plot summaries you'll see in imdb: it summarises a complicated thing.
The results are only verified correct for the recent past (for which we already have data for from actual, rather than proxy readings) but even the NAS committee concluded that from 900-1600 they had only mild confidence in the method, and before that very little.