@Michael_Barmann, using the github’s link to the raw version of your csv file, it works:
using HTTP, CSV
data_url = "https://raw.githubusercontent.com/MichaelBarmann/ParamEst_MRE/main/sample_data.csv"
my_file = CSV.File(HTTP.get(data_url).body)
df = DataFrame(my_file)
103×3 DataFrame
Row │ Date t Ic
│ String Int64 Int64
─────┼──────────────────────────
1 │ 8/24/2020 0 79
2 │ 8/25/2020 1 168
3 │ 8/26/2020 2 222
4 │ 8/27/2020 3 282
5 │ 8/28/2020 4 347
6 │ 8/29/2020 5 397
7 │ 8/30/2020 6 501
8 │ 8/31/2020 7 731
9 │ 9/1/2020 8 930
10 │ 9/2/2020 9 1050
11 │ 9/3/2020 10 1138
12 │ 9/4/2020 11 1242
13 │ 9/5/2020 12 1279
14 │ 9/6/2020 13 1316
⋮ │ ⋮ ⋮ ⋮
90 │ 11/21/2020 89 3998
91 │ 11/22/2020 90 4017
92 │ 11/23/2020 91 4043
93 │ 11/24/2020 92 4056
94 │ 11/25/2020 93 4070
95 │ 11/26/2020 94 4103
96 │ 11/27/2020 95 4124
97 │ 11/28/2020 96 4195
98 │ 11/29/2020 97 4221
99 │ 11/30/2020 98 4253
100 │ 12/1/2020 99 4276
101 │ 12/2/2020 100 4301
102 │ 12/3/2020 101 4321
103 │ 12/4/2020 102 4346
75 rows omitted