I'm inclined to think Cera is at least as reliable as the Economist

. But anyway, shouldn't you really be citing their most recent revised version of this graph?
https://www.cera.com/aspx/cda/client/report/reportImageDisplay.aspx?KID=5&CID=10720&IID=21246
Or the full report download...
https://www.cera.com/aspx/cda/filedisplay/publicfiledisplay.ashx?KID=5&CID=10720&PK=38356
Your earlier Cera graph shows plenty of growth in conventional oil production yet. The latest one looks to, err, have peaked, sorry to say. Average across all the spurious bumps of their undulating plateau and the line looks pretty flat at 85 mbd to me.
Unconventional oil still does roar away. But not nearly to the same extent as in the earlier graph.
Things overall look flat from 2020 at around 110 mbd. Then compare this current prediction to the one you cite which says supply will soar in a straight line to 135 mbd by 2035, only then peaking and flattening out.
So Cera may be reliable. It also seems to have changed its tune drastically in the space of a few years.
Like the IEA recent conversion to peak-ism, everyone's views are converging as they should. You would not be able to tell this just from Cera's rhetoric of course. So thanks for bringing attention to the graphs.