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The answer: Nobody knows. I've looked into this before and there are no official sources to determine what something is actually made in. The HV logo especially is a misnomer and isn't used anymore. You can find 3 or 4 Japanese blogs that will disagree on the same source video. You will get shows that air in SD-UP on some stations and HD on others. There is some agreement when there are obvious signs of SD-UP. The only semi-reliable way to find out is to find a station which lists the [HD] symbol on their schedule while the show is airing.
It is definitely the case that 720p is not standardized, but something that appears to be HD is used by the majority of production houses. As of last year, at least 1/4 of shows were still broadcast in non-HD formats (SD/SD-UP). Just as they upscale SD, they will just downscale for any stations that can't handle HD. (And yes, this means the majority of 720p subs are actually upscales.)
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