What is incomplete or requires clarification:
The context is not shown — for reliable identification of SA, the preceding structure (downward trend, presence of phases A-B) needs to be visible, and the segment in the screenshot is too short.
A long body is not always a mandatory criterion for SA. There are candlesticks with small bodies that can signal a halt in sales even more strongly.
There is no confirmation of purchases — in Wyckoff, after SA, a test of the level (Secondary Test) with lower volumes is often awaited, and there is no mention of this here.
False breakout is not taken into account — during a strong downward trend, even high volume and a return can be just a temporary halt.
RSI can remain in oversold territory for a long time, so it is not a guarantee of reversal, but just an additional hint.
In summary — the scheme works, but is too "idealized." In the real market, SA should always be checked against the full context of Wyckoff, not just three signs on one candle.