I can only guess that the unusual circuitry in what would otherwise be a typical linear current regulated LED lamp is to tick a box for European requirements.
It's using a separate current regulator on the capacitor to soften the current peak at the top of the sinewave. Probably to fudge a slightly better power factor.

I'm not sure what the voltage divider is monitoring.

The addition of a high speed diode in series with the bridge rectifier output is perplexing. Is it some odd attempt at adding faster reverse recovery to the rectifier? At 50/60Hz it doesn't seem like it's needed.

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