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I can't confirm the IBM infographic other than taking BOINCStats again:

May.2013 - 405,982 users of which 72,522 active, generating a RAC output of 117M
May.2018 - 541,928 users of which 50,138 active, generating a RAC output of 134M

Taking these numbers a side, WCG has achieved a lot in the last 5 years and I believe this is what we should focus on!

For what it's worth, I took this info graphic not to wave with numbers of active users, but to display what they have accomplish together.

As you state, the numbers are from 2013. It doesn't state any numbers of active users.

My text regarding boinc about 500.000+ active users is from last year and may have changed.