I'm in the same boat (31 March rollover). I had qualified already, but the 100SCs are welcome towards retaining this year. My PC tally also includes points from 15 March...I've received 100 SCs at the start of my new membership year.
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The wiping of my previous year's tally and the addition of these credits are not showing up in the Points Activity page yet.
I note that my Points Club Plus tally is already climbing, looks like they've included points posted since 15 March. Makes me feel a little better as I didn't get a status extension.