To determine S&P's adjusted leverage trend for ERG S.P.A. for the year 2022, we calculate the Net Debt to EBITDA ratio for the years 2021 and 2022, and then find the year-over-year gap.

**1. EBITDA Calculation:**
*   **2021 EBITDA:** Profit/Loss From Operating Activities Before Interest, Taxes, Depreciation, and Amortisation Expense = 396,680,000 EUR
*   **2022 EBITDA:** Profit/Loss From Operating Activities Before Interest, Taxes, Depreciation, and Amortisation Expense = 499,430,000 EUR

**2. Total Debt Calculation:**
*   **2021 Total Debt:** Other Noncurrent Financial Liabilities (2,064,088,000 EUR) + Noncurrent Lease Liabilities (122,663,000 EUR) + Other Current Financial Liabilities (1,342,688,000 EUR) + Current Lease Liabilities (6,282,000 EUR) = 3,535,721,000 EUR
*   **2022 Total Debt:** Other Noncurrent Financial Liabilities (1,751,255,000 EUR) + Noncurrent Lease Liabilities (150,955,000 EUR) + Other Current Financial Liabilities (389,716,000 EUR) + Current Lease Liabilities (6,362,000 EUR) = 2,298,288,000 EUR

**3. Net Debt Calculation (Total Debt - Cash and Cash Equivalents):**
*   **2021 Net Debt:** 3,535,721,000 EUR - 860,352,000 EUR = 2,675,369,000 EUR
*   **2022 Net Debt:** 2,298,288,000 EUR - 392,811,000 EUR = 1,905,477,000 EUR
*(Note: A significant reduction in debt stems from the sale of subsidiaries, yielding over 1.2 billion EUR in proceeds).*

**4. Net Debt / EBITDA Ratio:**
*   **2021 Ratio:** 2,675,369,000 EUR / 396,680,000 EUR ≈ 6.74x
*   **2022 Ratio:** 1,905,477,000 EUR / 499,430,000 EUR ≈ 3.82x

**5. Year-on-Year Gap:**
*   **Gap:** 3.82x - 6.74x = -2.92x

Because the Net Debt / EBITDA ratio decreased by 2.92x (which is well below the -0.3x threshold for an improvement), the leverage profile has strengthened significantly. 

<answer>Improving</answer>