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I think the suggestion is about right. You want one consistent sub-floor which won't flex or contract differently and it will allow you to improve the thermal efficiency. It would also give you the opportunity to re-route any pipes or services at the same time. Alternative would be to overboard the original floor boards and build things up that way but wouldn't seem the best option.
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Insulation, new subfloor, floor heating, win?
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Isn't T&G chipboard the usual goto for subfloor?
Tenderloin
c.h.e.
NotThamesWater
@Sumo
1 = original floor boards
2 = OSB boards in the extension
3 = ply that was on top of the floor which was tiled
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