If you mean "solid" as in functional and thematic , yes — it's a well-produced book. If you mean strong or meta-defining , no. For 10th edition, Guard uses an Index with very different rules.
The 9th Ed Astra Militarum codex was widely considered underwhelming upon release (late 2022 / early 2023) — not a "solid report" in terms of power, but solid in flavor and structure . It arrived very late in 9th edition, just months before 10th launched, so its competitive window was short. Warhammer 40-000 Codex - Astra Militarum 9th Ed...